981
981 is a composite number, odd, a calendar year.
Historical context — 981 AD
Calendar year
Year 981 (CMLXXXI) was a common year starting on Saturday of the Julian calendar.
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Historical context — 981 BC
Decade
The 980s BC is a decade that lasted from 989 BC to 980 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
-
Monday
January 1, 981
- Ended on
-
Monday
December 31, 981
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
980s
980–989
- Century
-
10th century
901–1000
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,045
1045 years before 2026.
In other calendars
- Hebrew
-
4741 / 4742 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
370 / 371 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
-
1524 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
359 / 360 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
973 / 974 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
903 / 902 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 18
- Digit product
- 72
- Digital root
- 9
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 189
- Flips to (rotate 180°)
- 186
- Recamán's sequence
- a(4,457) = 981
- Square (n²)
- 962,361
- Cube (n³)
- 944,076,141
- Divisor count
- 6
- σ(n) — sum of divisors
- 1,430
- φ(n) — Euler's totient
- 648
- Sum of prime factors
- 115
Primality
Prime factorization: 3 2 × 109
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- nine hundred eighty-one
- Ordinal
- 981st
- Roman numeral
- CMLXXXI
- Binary
- 1111010101
- Octal
- 1725
- Hexadecimal
- 0x3D5
- Base64
- A9U=
- One's complement
- 64,554 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ϡπαʹ
- Mayan (base 20)
- 𝋢·𝋩·𝋡
- Chinese
- 九百八十一
- Chinese (financial)
- 玖佰捌拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 981 = 7
- e — Euler's number (e)
- Digit 981 = 2
- φ — Golden ratio (φ)
- Digit 981 = 2
- √2 — Pythagoras's (√2)
- Digit 981 = 5
- ln 2 — Natural log of 2
- Digit 981 = 2
- γ — Euler-Mascheroni (γ)
- Digit 981 = 6
Also seen as
UTF-8 encoding: CF 95 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.213.
- Address
- 0.0.3.213
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.213
Unspecified address (0.0.0.0/8) — "this network" placeholder.