Number

1,569

1,569 is a composite number, odd, a calendar year.

1,569 (one thousand five hundred sixty-nine) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 3 × 523. Written other ways, in Roman numerals it is MDLXIX and in binary, 11000100001.

Arithmetic Number Ascending Digits Cube-Free Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Interestingness

★ ★ ★ ★ ☆

6 notable facts · grade B

1,557 1,558 1,559 1,560 1,561 1,562 1,563 1,564 1,565 1,566 1,567 1,568 1,569 1,570 1,571 1,572 1,573 1,574 1,575 1,576 1,577 1,578 1,579 1,580 1,581

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Notable events — 1569 AD

Jul 1 The Union of Lublin creates the Polish-Lithuanian Commonwealth.
Undated Gerardus Mercator publishes his world map projection.
Nov 9 The Rising of the North against Elizabeth I begins in England.

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: Wednesday
January 1, 1569
Ended on: Wednesday
December 31, 1569
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 1560s
1560–1569
Century: 16th century
1501–1600
Millennium: 2nd millennium
1001–2000
Years ago: 457
457 years before 2026.

In other calendars

Hebrew: 5329 / 5330 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 976 / 977 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Snake
Sexagenary cycle position 6 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2112 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 947 / 948 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1561 / 1562 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1491 / 1490 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 21
Digit product: 270
Digital root: 3
Palindrome: No
Bit width: 11 bits
Reversed: 9,651
Recamán's sequence: a(1,366) = 1,569
Square (n²): 2,461,761
Cube (n³): 3,862,503,009
Divisor count: 4
σ(n) — sum of divisors: 2,096
φ(n) — Euler's totient: 1,044
Sum of prime factors: 526

Primality

Prime factorization: 3 × 523

Nearest primes: 1,567 (−2) · 1,571 (+2)

Divisors & multiples

All divisors (4)

1 · 3 · 523 · 1569

Aliquot sum (sum of proper divisors): 527

Factor pairs (a × b = 1,569)

1 × 1569

3 × 523

First multiples

1,569 · 3,138 (double) · 4,707 · 6,276 · 7,845 · 9,414 · 10,983 · 12,552 · 14,121 · 15,690

Sums & aliquot sequence

As consecutive integers: 784 + 785 522 + 523 + 524 259 + 260 + 261 + 262 + 263 + 264

Aliquot sequence: 1,569 → 527 → 49 → 8 → 7 → 1 → 0 — terminates at zero

Continued fraction of √n

√1,569 = [39; (1, 1, 1, 1, 3, 5, 1, 4, 2, 3, 1, 2, 1, 1, 9, 3, 15, 1, 1, 10, 1, 4, 26, 4, …)]

Period length 46 — the block in parentheses repeats forever.

Representations

In words: one thousand five hundred sixty-nine
Ordinal: 1569th
Roman numeral: MDLXIX
Binary: 11000100001
Octal: 3041
Hexadecimal: 0x621
Base64: BiE=
One's complement: 63,966 (16-bit)
Scientific notation: 1.569 × 10³
As a duration: 1,569 s = 26 minutes, 9 seconds

In other bases

ternary (3) 2011010

quaternary (4) 120201

quinary (5) 22234

senary (6) 11133

septenary (7) 4401

nonary (9) 2133

undecimal (11) 11a7

duodecimal (12) aa9

tridecimal (13) 939

tetradecimal (14) 801

pentadecimal (15) 6e9

Palindromic in base 13

As an angle

1,569° = 4 × 360° + 129°

129° ≈ 2.251 rad

Compass bearing: SE (southeast)

Why does a circle have 360 degrees? →

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αφξθʹ
Mayan (base 20): 𝋣·𝋲·𝋩
Chinese: 一千五百六十九
Chinese (financial): 壹仟伍佰陸拾玖

In other modern scripts

Eastern Arabic ١٥٦٩ Devanagari १५६९ Bengali ১৫৬৯ Tamil ௧௫௬௯ Thai ๑๕๖๙ Tibetan ༡༥༦༩ Khmer ១៥៦៩ Lao ໑໕໖໙ Burmese ၁၅၆၉

Digit at this position in famous constants

π — Pi (π): Digit 1,569 = 6
e — Euler's number (e): Digit 1,569 = 2
φ — Golden ratio (φ): Digit 1,569 = 9
√2 — Pythagoras's (√2): Digit 1,569 = 4
ln 2 — Natural log of 2: Digit 1,569 = 0
γ — Euler-Mascheroni (γ): Digit 1,569 = 8

Also seen as

Unicode codepoint

Arabic Letter Hamza

U+0621

Other letter (Lo)

UTF-8 encoding: D8 A1 (2 bytes).

Lookup U+0621 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000621

RGB(0, 6, 33)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.33.

Address: 0.0.6.33
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.33

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

Musical pitch

Heard as a frequency, 1,569 Hz is closest to:

Concert pitch (A4 = 440 Hz): G6 (1568 Hz, +1¢)
Scientific pitch (C4 = 256 Hz): G6 (1534.3 Hz, +39¢)
Baroque pitch (A4 = 415 Hz): G♯6 (1566.8 Hz, +2¢)

Position in π

The digit sequence 1569 first appears in π at position 2,327 of the decimal expansion (the 2,327ordinal-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 1569 on Pi Search ↗