1,080
1,080 is a composite number, even, a calendar year.
Historical context — 1080 AD
Calendar year
Year 1080 (MLXXX) was a leap year starting on Wednesday of the Julian calendar.
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Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1080
- Ended on
-
Friday
December 31, 1080
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1080s
1080–1089
- Century
-
11th century
1001–1100
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
946
946 years before 2026.
In other calendars
- Hebrew
-
4840 / 4841 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
472 / 473 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Monkey
Sexagenary cycle position 57 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1623 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
458 / 459 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1072 / 1073 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1002 / 1001 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 9
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 801
- Flips to (rotate 180°)
- 801
- Recamán's sequence
- a(4,259) = 1,080
- Square (n²)
- 1,166,400
- Cube (n³)
- 1,259,712,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 3,600
- φ(n) — Euler's totient
- 288
- Sum of prime factors
- 20
Primality
Prime factorization: 2 3 × 3 3 × 5
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eighty
- Ordinal
- 1080th
- Roman numeral
- MLXXX
- Binary
- 10000111000
- Octal
- 2070
- Hexadecimal
- 0x438
- Base64
- BDg=
- One's complement
- 64,455 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵απʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋠
- Chinese
- 一千零八十
- Chinese (financial)
- 壹仟零捌拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,080 = 9
- e — Euler's number (e)
- Digit 1,080 = 0
- φ — Golden ratio (φ)
- Digit 1,080 = 5
- √2 — Pythagoras's (√2)
- Digit 1,080 = 3
- ln 2 — Natural log of 2
- Digit 1,080 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,080 = 7
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1080, here are decompositions:
- 11 + 1069 = 1080
- 17 + 1063 = 1080
- 19 + 1061 = 1080
- 29 + 1051 = 1080
- 31 + 1049 = 1080
- 41 + 1039 = 1080
- 47 + 1033 = 1080
- 59 + 1021 = 1080
Showing the first eight; more decompositions exist.
UTF-8 encoding: D0 B8 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.56.
- Address
- 0.0.4.56
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.56
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1080 first appears in π at position 11,601 of the decimal expansion (the 11,601ordinal-suffix:st 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.