1,085
1,085 is a composite number, odd, a calendar year.
1,085 (one thousand eighty-five) is an odd 4-digit number. It is a composite number with 8 divisors, and factors as 5 × 7 × 31. Written other ways, in Roman numerals it is MLXXXV and in binary, 10000111101.
Interestingness
Historical context — 1085 AD
Calendar year
Year 1085 (MLXXXV) was a common year starting on Wednesday 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1085
- Ended on
-
Thursday
December 31, 1085
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
1080s
1080–1089
- Century
-
11th century
1001–1100
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
941
941 years before 2026.
In other calendars
- Hebrew
-
4845 / 4846 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
477 / 478 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
-
1628 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
463 / 464 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1077 / 1078 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1007 / 1006 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 7 × 31
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,085 = [32; (1, 15, 2, 15, 1, 64)]
Period length 6 — the block in parentheses repeats forever.
Representations
- In words
- one thousand eighty-five
- Ordinal
- 1085th
- Roman numeral
- MLXXXV
- Binary
- 10000111101
- Octal
- 2075
- Hexadecimal
- 0x43D
- Base64
- BD0=
- One's complement
- 64,450 (16-bit)
- Scientific notation
- 1.085 × 10³
- As a duration
- 1,085 s = 18 minutes, 5 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵απεʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋥
- Chinese
- 一千零八十五
- Chinese (financial)
- 壹仟零捌拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,085 = 7
- e — Euler's number (e)
- Digit 1,085 = 4
- φ — Golden ratio (φ)
- Digit 1,085 = 0
- √2 — Pythagoras's (√2)
- Digit 1,085 = 7
- ln 2 — Natural log of 2
- Digit 1,085 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,085 = 0
Also seen as
UTF-8 encoding: D0 BD (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.61.
- Address
- 0.0.4.61
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.61
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,085 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯6 (1108.7 Hz, -37¢)
- Scientific pitch (C4 = 256 Hz): C♯6 (1084.9 Hz, exact)
- Baroque pitch (A4 = 415 Hz): D6 (1107.9 Hz, -36¢)
The digit sequence 1085 first appears in π at position 7,583 of the decimal expansion (the 7,583ordinal-suffix:rd 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.