1,881
1,881 is a composite number, odd, a calendar year.
Notable events — 1881 AD
- Mar 13 Tsar Alexander II of Russia is assassinated by a bomb in St. Petersburg.
- Jul 2 President James Garfield is shot in Washington; he dies September 19.
- Oct 26 The Gunfight at the O.K. Corral takes place in Tombstone, Arizona.
- Mar 16 Frederick Douglass becomes Recorder of Deeds for Washington, D.C.
- Undated A wave of pogroms against Jews sweeps through the Russian Empire.
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
-
Saturday
January 1, 1881
- Ended on
-
Saturday
December 31, 1881
- Friday the 13ths
-
1
One Friday the 13th this year.
- Easter Sunday
-
April 17
Sunday, April 17, 1881
- Decade
-
1880s
1880–1889
- Century
-
19th century
1801–1900
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
145
145 years before 2026.
In other calendars
- Hebrew
-
5641 / 5642 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
1298 / 1299 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Snake
Sexagenary cycle position 18 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2424 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
1259 / 1260 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1873 / 1874 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1803 / 1802 Saka
Indian national calendar; year starts in March.
- Japanese
-
Meiji 14
Reign-era counting from the start of each emperor's reign.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 64
- Digital root
- 9
- Palindrome
- Yes
- Bit width
- 11 bits
- Recamán's sequence
- a(7,982) = 1,881
- Square (n²)
- 3,538,161
- Cube (n³)
- 6,655,280,841
- Divisor count
- 12
- σ(n) — sum of divisors
- 3,120
- φ(n) — Euler's totient
- 1,080
- Sum of prime factors
- 36
Primality
Prime factorization: 3 2 × 11 × 19
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand eight hundred eighty-one
- Ordinal
- 1881st
- Roman numeral
- MDCCCLXXXI
- Binary
- 11101011001
- Octal
- 3531
- Hexadecimal
- 0x759
- Base64
- B1k=
- One's complement
- 63,654 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵αωπαʹ
- Mayan (base 20)
- 𝋤·𝋮·𝋡
- Chinese
- 一千八百八十一
- Chinese (financial)
- 壹仟捌佰捌拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,881 = 4
- e — Euler's number (e)
- Digit 1,881 = 1
- φ — Golden ratio (φ)
- Digit 1,881 = 1
- √2 — Pythagoras's (√2)
- Digit 1,881 = 0
- ln 2 — Natural log of 2
- Digit 1,881 = 0
- γ — Euler-Mascheroni (γ)
- Digit 1,881 = 9
Also seen as
UTF-8 encoding: DD 99 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.7.89.
- Address
- 0.0.7.89
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.7.89
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1881 first appears in π at position 847 of the decimal expansion (the 847ordinal-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.