Number

1,556

1,556 is a composite number, even, a calendar year.

1,556 (one thousand five hundred fifty-six) is an even 4-digit number. It is a composite number with 6 divisors, and factors as 2² × 389. Written other ways, in Roman numerals it is MDLVI and in binary, 11000010100.

Arithmetic Number Cube-Free Deficient Number Evil Number Recamán's Sequence Year

Interestingness

★ ☆ ☆ ☆ ☆

3 notable facts · grade F

1,544 1,545 1,546 1,547 1,548 1,549 1,550 1,551 1,552 1,553 1,554 1,555 1,556 1,557 1,558 1,559 1,560 1,561 1,562 1,563 1,564 1,565 1,566 1,567 1,568

less more

Notable events — 1556 AD

Jan 16 Charles V abdicates as king of Spain; Philip II succeeds him.
Jan 23 The Shaanxi earthquake in China kills an estimated 830,000.
Mar 21 Archbishop Thomas Cranmer is burned at the stake.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

Year facts

Year type: Leap year
Divisible by 4 and not by 100; February has 29 days.
Days in year: 366
ISO weeks: 52
Started on: Sunday
January 1, 1556
Ended on: Monday
December 31, 1556
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 1550s
1550–1559
Century: 16th century
1501–1600
Millennium: 2nd millennium
1001–2000
Years ago: 470
470 years before 2026.

In other calendars

Hebrew: 5316 / 5317 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 963 / 964 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Fire zodiac:Dragon
Sexagenary cycle position 53 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2099 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 934 / 935 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1548 / 1549 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1478 / 1477 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 4
Digit sum: 17
Digit product: 150
Digital root: 8
Palindrome: No
Bit width: 11 bits
Reversed: 6,551
Recamán's sequence: a(1,448) = 1,556
Square (n²): 2,421,136
Cube (n³): 3,767,287,616
Divisor count: 6
σ(n) — sum of divisors: 2,730
φ(n) — Euler's totient: 776
Sum of prime factors: 393

Primality

Prime factorization: 2 ² × 389

Nearest primes: 1,553 (−3) · 1,559 (+3)

Divisors & multiples

All divisors (6)

1 · 2 · 4 · 389 · 778 (half) · 1556

Aliquot sum (sum of proper divisors): 1,174

Factor pairs (a × b = 1,556)

1 × 1556

2 × 778

4 × 389

First multiples

1,556 · 3,112 (double) · 4,668 · 6,224 · 7,780 · 9,336 · 10,892 · 12,448 · 14,004 · 15,560

Sums & aliquot sequence

As a sum of two squares: 20² + 34²

As consecutive integers: 191 + 192 + … + 198

Aliquot sequence: 1,556 → 1,174 → 590 → 490 → 536 → 484 → 447 → 153 → 81 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Continued fraction of √n

√1,556 = [39; (2, 4, 6, 1, 18, 1, 6, 4, 2, 78)]

Period length 10 — the block in parentheses repeats forever.

Representations

In words: one thousand five hundred fifty-six
Ordinal: 1556th
Roman numeral: MDLVI
Binary: 11000010100
Octal: 3024
Hexadecimal: 0x614
Base64: BhQ=
One's complement: 63,979 (16-bit)
Scientific notation: 1.556 × 10³
As a duration: 1,556 s = 25 minutes, 56 seconds

In other bases

ternary (3) 2010122

quaternary (4) 120110

quinary (5) 22211

senary (6) 11112

septenary (7) 4352

nonary (9) 2118

undecimal (11) 1195

duodecimal (12) a98

tridecimal (13) 929

tetradecimal (14) 7d2

pentadecimal (15) 6db

Palindromic in base 13

As an angle

1,556° = 4 × 360° + 116°

116° ≈ 2.025 rad

Compass bearing: ESE (east-southeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αφνϛʹ
Mayan (base 20): 𝋣·𝋱·𝋰
Chinese: 一千五百五十六
Chinese (financial): 壹仟伍佰伍拾陸

In other modern scripts

Eastern Arabic ١٥٥٦ Devanagari १५५६ Bengali ১৫৫৬ Tamil ௧௫௫௬ Thai ๑๕๕๖ Tibetan ༡༥༥༦ Khmer ១៥៥៦ Lao ໑໕໕໖ Burmese ၁၅၅၆

Digit at this position in famous constants

π — Pi (π): Digit 1,556 = 8
e — Euler's number (e): Digit 1,556 = 9
φ — Golden ratio (φ): Digit 1,556 = 2
√2 — Pythagoras's (√2): Digit 1,556 = 9
ln 2 — Natural log of 2: Digit 1,556 = 9
γ — Euler-Mascheroni (γ): Digit 1,556 = 1

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1556, here are decompositions:

3 + 1553 = 1556
7 + 1549 = 1556
13 + 1543 = 1556
67 + 1489 = 1556
73 + 1483 = 1556
97 + 1459 = 1556
103 + 1453 = 1556
109 + 1447 = 1556

Showing the first eight; more decompositions exist.

Unicode codepoint

Arabic Sign Takhallus

U+0614

Non-spacing mark (Mn)

UTF-8 encoding: D8 94 (2 bytes).

Lookup U+0614 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000614

RGB(0, 6, 20)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.20.

Address: 0.0.6.20
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.20

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Musical pitch

Heard as a frequency, 1,556 Hz is closest to:

Concert pitch (A4 = 440 Hz): G6 (1568 Hz, -13¢)
Scientific pitch (C4 = 256 Hz): G6 (1534.3 Hz, +24¢)
Baroque pitch (A4 = 415 Hz): G♯6 (1566.8 Hz, -12¢)

Position in π

The digit sequence 1556 first appears in π at position 3,553 of the decimal expansion (the 3,553ordinal-suffix:rd digit after the integer 3).

Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.

Look up 1556 on Pi Search ↗