1,565
1,565 is a composite number, odd, a calendar year.
1,565 (one thousand five hundred sixty-five) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 5 × 313. Written other ways, in Roman numerals it is MDLXV and in binary, 11000011101.
Interestingness
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
Primality
Prime factorization: 5 × 313
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,565 = [39; (1, 1, 3, 1, 1, 1, 19, 7, 7, 19, 1, 1, 1, 3, 1, 1, 78)]
Period length 17 — the block in parentheses repeats forever.
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)
- Scientific notation
- 1.565 × 10³
- As a duration
- 1,565 s = 26 minutes, 5 seconds
As an angle
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
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
UTF-8 encoding: D8 9D (2 bytes).
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.
Heard as a frequency, 1,565 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G6 (1568 Hz, -3¢)
- Scientific pitch (C4 = 256 Hz): G6 (1534.3 Hz, +34¢)
- Baroque pitch (A4 = 415 Hz): G♯6 (1566.8 Hz, -2¢)
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.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.