Number

1,565

1,565 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Year

Notable events — 1565 AD

Sep 7 The Knights of Malta repel an Ottoman siege.
Sep 8 St. Augustine, Florida, is founded by Pedro Menéndez de Avilés.
Jul 29 Mary Queen of Scots marries Lord Darnley.

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: Friday
January 1, 1565
Ended on: Friday
December 31, 1565
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: 461
461 years before 2026.

In other calendars

Hebrew: 5325 / 5326 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 972 / 973 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Wood zodiac:Ox
Sexagenary cycle position 2 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 2108 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 943 / 944 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1557 / 1558 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1487 / 1486 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 17
Digit product: 150
Digital root: 8
Palindrome: No
Bit width: 11 bits
Reversed: 5,651
Recamán's sequence: a(1,430) = 1,565
Square (n²): 2,449,225
Cube (n³): 3,833,037,125
Divisor count: 4
σ(n) — sum of divisors: 1,884
φ(n) — Euler's totient: 1,248
Sum of prime factors: 318

Primality

Prime factorization: 5 × 313

Nearest primes: 1,559 (−6) · 1,567 (+2)

Divisors & multiples

All divisors (4)

1 · 5 · 313 · 1565

Aliquot sum (sum of proper divisors): 319

Factor pairs (a × b = 1,565)

1 × 1565

5 × 313

First multiples

1,565 · 3,130 (double) · 4,695 · 6,260 · 7,825 · 9,390 · 10,955 · 12,520 · 14,085 · 15,650

Sums & aliquot sequence

As a sum of two squares: 11² + 38² = 14² + 37²

As consecutive integers: 782 + 783 311 + 312 + 313 + 314 + 315 152 + 153 + … + 161

Aliquot sequence: 1,565 → 319 → 41 → 1 → 0 — terminates at zero

Representations

In words: one thousand five hundred sixty-five
Ordinal: 1565th
Roman numeral: MDLXV
Binary: 11000011101
Octal: 3035
Hexadecimal: 0x61D
Base64: Bh0=
One's complement: 63,970 (16-bit)

In other bases

ternary (3) 2010222

quaternary (4) 120131

quinary (5) 22230

senary (6) 11125

septenary (7) 4364

nonary (9) 2128

undecimal (11) 11a3

duodecimal (12) aa5

tridecimal (13) 935

tetradecimal (14) 7db

pentadecimal (15) 6e5

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵αφξεʹ
Mayan (base 20): 𝋣·𝋲·𝋥
Chinese: 一千五百六十五
Chinese (financial): 壹仟伍佰陸拾伍

In other modern scripts

Eastern Arabic ١٥٦٥ Devanagari १५६५ Bengali ১৫৬৫ Tamil ௧௫௬௫ Thai ๑๕๖๕ Tibetan ༡༥༦༥ Khmer ១៥៦៥ Lao ໑໕໖໕ Burmese ၁၅၆၅

Digit at this position in famous constants

π — Pi (π): Digit 1,565 = 5
e — Euler's number (e): Digit 1,565 = 0
φ — Golden ratio (φ): Digit 1,565 = 7
√2 — Pythagoras's (√2): Digit 1,565 = 3
ln 2 — Natural log of 2: Digit 1,565 = 7
γ — Euler-Mascheroni (γ): Digit 1,565 = 3

Also seen as

Unicode codepoint

Arabic End Of Text Mark

U+061D

Other punctuation (Po)

UTF-8 encoding: D8 9D (2 bytes).

Lookup U+061D on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00061D

RGB(0, 6, 29)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.29.

Address: 0.0.6.29
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.6.29

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

Position in π

The digit sequence 1565 first appears in π at position 13,585 of the decimal expansion (the 13,585ordinal-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 1565 on Pi Search ↗