Number

1,550

1,550 is a composite number, even, a calendar year.

Arithmetic Number Deficient Number Gapful Number Odious Number Pernicious Number Recamán's Sequence Year

Notable events — 1550 AD

Mar 1 The Truce of Boulogne returns the city to France.
Aug 15 The Valladolid debate begins on the rights of indigenous Americans.
Feb 8 Pope Julius III is elected.

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

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Sunday
January 1, 1550
Ended on: Sunday
December 31, 1550
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 1550s
1550–1559
Century: 16th century
1501–1600
Millennium: 2nd millennium
1001–2000
Years ago: 476
476 years before 2026.

In other calendars

Hebrew: 5310 / 5311 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 956 / 957 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2093 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 928 / 929 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1542 / 1543 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1472 / 1471 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 4
Digit sum: 11
Digit product: 0
Digital root: 2
Palindrome: No
Bit width: 11 bits
Reversed: 551
Recamán's sequence: a(1,460) = 1,550
Square (n²): 2,402,500
Cube (n³): 3,723,875,000
Divisor count: 12
σ(n) — sum of divisors: 2,976
φ(n) — Euler's totient: 600
Sum of prime factors: 43

Primality

Prime factorization: 2 × 5 ² × 31

Nearest primes: 1,549 (−1) · 1,553 (+3)

Divisors & multiples

All divisors (12)

1 · 2 · 5 · 10 · 25 · 31 · 50 · 62 · 155 · 310 · 775 (half) · 1550

Aliquot sum (sum of proper divisors): 1,426

Factor pairs (a × b = 1,550)

1 × 1550

2 × 775

5 × 310

10 × 155

25 × 62

31 × 50

First multiples

1,550 · 3,100 (double) · 4,650 · 6,200 · 7,750 · 9,300 · 10,850 · 12,400 · 13,950 · 15,500

Sums & aliquot sequence

As consecutive integers: 386 + 387 + 388 + 389 308 + 309 + 310 + 311 + 312 68 + 69 + … + 87 50 + 51 + … + 74

Aliquot sequence: 1,550 → 1,426 → 878 → 442 → 314 → 160 → 218 → 112 → 136 → 134 → 70 → 74 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: one thousand five hundred fifty
Ordinal: 1550th
Roman numeral: MDL
Binary: 11000001110
Octal: 3016
Hexadecimal: 0x60E
Base64: Bg4=
One's complement: 63,985 (16-bit)

In other bases

ternary (3) 2010102

quaternary (4) 120032

quinary (5) 22200

senary (6) 11102

septenary (7) 4343

nonary (9) 2112

undecimal (11) 118a

duodecimal (12) a92

tridecimal (13) 923

tetradecimal (14) 7ca

pentadecimal (15) 6d5

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): ͵αφνʹ
Mayan (base 20): 𝋣·𝋱·𝋪
Chinese: 一千五百五十
Chinese (financial): 壹仟伍佰伍拾

In other modern scripts

Eastern Arabic ١٥٥٠ Devanagari १५५० Bengali ১৫৫০ Tamil ௧௫௫௦ Thai ๑๕๕๐ Tibetan ༡༥༥༠ Khmer ១៥៥០ Lao ໑໕໕໐ Burmese ၁၅၅၀

Digit at this position in famous constants

π — Pi (π): Digit 1,550 = 5
e — Euler's number (e): Digit 1,550 = 1
φ — Golden ratio (φ): Digit 1,550 = 5
√2 — Pythagoras's (√2): Digit 1,550 = 5
ln 2 — Natural log of 2: Digit 1,550 = 8
γ — Euler-Mascheroni (γ): Digit 1,550 = 7

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1550, here are decompositions:

7 + 1543 = 1550
19 + 1531 = 1550
61 + 1489 = 1550
67 + 1483 = 1550
79 + 1471 = 1550
97 + 1453 = 1550
103 + 1447 = 1550
127 + 1423 = 1550

Showing the first eight; more decompositions exist.

Unicode codepoint

Arabic Poetic Verse Sign

U+060E

Other symbol (So)

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

Lookup U+060E on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00060E

RGB(0, 6, 14)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.14.

Address: 0.0.6.14
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.14

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

Position in π

The digit sequence 1550 first appears in π at position 4,389 of the decimal expansion (the 4,389ordinal-suffix:th 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 1550 on Pi Search ↗