1,087
1,087 is a prime, odd, a calendar year.
1,087 (one thousand eighty-seven) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MLXXXVII and in binary, 10000111111.
Interestingness
Historical context — 1087 AD
Calendar year
Year 1087 (MLXXXVII) was a common year starting on Friday of the Julian calendar.
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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
-
Saturday
January 1, 1087
- Ended on
-
Saturday
December 31, 1087
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1080s
1080–1089
- Century
-
11th century
1001–1100
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
939
939 years before 2026.
In other calendars
- Hebrew
-
4847 / 4848 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
479 / 480 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Rabbit
Sexagenary cycle position 4 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1630 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
465 / 466 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1079 / 1080 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1009 / 1008 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,087 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,087 = [32; (1, 31, 1, 64)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- one thousand eighty-seven
- Ordinal
- 1087th
- Roman numeral
- MLXXXVII
- Binary
- 10000111111
- Octal
- 2077
- Hexadecimal
- 0x43F
- Base64
- BD8=
- One's complement
- 64,448 (16-bit)
- Scientific notation
- 1.087 × 10³
- As a duration
- 1,087 s = 18 minutes, 7 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵απζʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋧
- Chinese
- 一千零八十七
- Chinese (financial)
- 壹仟零捌拾柒
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,087 = 1
- e — Euler's number (e)
- Digit 1,087 = 6
- φ — Golden ratio (φ)
- Digit 1,087 = 4
- √2 — Pythagoras's (√2)
- Digit 1,087 = 6
- ln 2 — Natural log of 2
- Digit 1,087 = 1
- γ — Euler-Mascheroni (γ)
- Digit 1,087 = 2
Also seen as
UTF-8 encoding: D0 BF (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.63.
- Address
- 0.0.4.63
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.63
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,087 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯6 (1108.7 Hz, -34¢)
- Scientific pitch (C4 = 256 Hz): C♯6 (1084.9 Hz, +3¢)
- Baroque pitch (A4 = 415 Hz): D6 (1107.9 Hz, -33¢)
The digit sequence 1087 first appears in π at position 10,281 of the decimal expansion (the 10,281ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.