851
851 is a composite number, odd, a calendar year.
Historical context — 851 AD
Calendar year
Year 851 (DCCCLI) was a common year starting on Thursday of the Julian calendar.
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Historical context — 851 BC
Decade
This article concerns the period 859 BC – 850 BC.
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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
-
Sunday
January 1, 851
- Ended on
-
Sunday
December 31, 851
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
850s
850–859
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,175
1175 years before 2026.
In other calendars
- Hebrew
-
4611 / 4612 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
236 / 237 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Goat
Sexagenary cycle position 8 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1394 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
229 / 230 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
843 / 844 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
773 / 772 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 23 × 37
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred fifty-one
- Ordinal
- 851st
- Roman numeral
- DCCCLI
- Binary
- 1101010011
- Octal
- 1523
- Hexadecimal
- 0x353
- Base64
- A1M=
- One's complement
- 64,684 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹 𒌋𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ωναʹ
- Mayan (base 20)
- 𝋢·𝋢·𝋫
- Chinese
- 八百五十一
- Chinese (financial)
- 捌佰伍拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 851 = 1
- e — Euler's number (e)
- Digit 851 = 8
- φ — Golden ratio (φ)
- Digit 851 = 3
- √2 — Pythagoras's (√2)
- Digit 851 = 7
- ln 2 — Natural log of 2
- Digit 851 = 2
- γ — Euler-Mascheroni (γ)
- Digit 851 = 5
Also seen as
UTF-8 encoding: CD 93 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.83.
- Address
- 0.0.3.83
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.83
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.