1,161
1,161 is a composite number, odd, a calendar year.
1,161 (one thousand one hundred sixty-one) is an odd 4-digit number. It is a composite number with 8 divisors, and factors as 3³ × 43. Written other ways, in Roman numerals it is MCLXI and in binary, 10010001001.
Interestingness
Historical context — 1161 AD
Calendar year
Year 1161 (MCLXI) was a common year starting on Sunday 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
-
Sunday
January 1, 1161
- Ended on
-
Sunday
December 31, 1161
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1160s
1160–1169
- Century
-
12th century
1101–1200
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
865
865 years before 2026.
In other calendars
- Hebrew
-
4921 / 4922 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
555 / 557 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
-
1704 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
539 / 540 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1153 / 1154 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1083 / 1082 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 9
- Digit product
- 6
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 1,611
- Flips to (rotate 180°)
- 1,911
- Recamán's sequence
- a(1,850) = 1,161
- Square (n²)
- 1,347,921
- Cube (n³)
- 1,564,936,281
- Divisor count
- 8
- σ(n) — sum of divisors
- 1,760
- φ(n) — Euler's totient
- 756
- Sum of prime factors
- 52
Primality
Prime factorization: 3 3 × 43
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,161 = [34; (13, 1, 1, 1, 1, 2, 8, 7, 2, 4, 1, 3, 2, 3, 1, 4, 2, 7, 8, 2, 1, 1, 1, 1, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- one thousand one hundred sixty-one
- Ordinal
- 1161st
- Roman numeral
- MCLXI
- Binary
- 10010001001
- Octal
- 2211
- Hexadecimal
- 0x489
- Base64
- BIk=
- One's complement
- 64,374 (16-bit)
- Scientific notation
- 1.161 × 10³
- As a duration
- 1,161 s = 19 minutes, 21 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵αρξαʹ
- Mayan (base 20)
- 𝋢·𝋲·𝋡
- Chinese
- 一千一百六十一
- Chinese (financial)
- 壹仟壹佰陸拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,161 = 6
- e — Euler's number (e)
- Digit 1,161 = 9
- φ — Golden ratio (φ)
- Digit 1,161 = 8
- √2 — Pythagoras's (√2)
- Digit 1,161 = 1
- ln 2 — Natural log of 2
- Digit 1,161 = 0
- γ — Euler-Mascheroni (γ)
- Digit 1,161 = 7
Also seen as
UTF-8 encoding: D2 89 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.137.
- Address
- 0.0.4.137
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.137
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,161 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D6 (1174.7 Hz, -20¢)
- Scientific pitch (C4 = 256 Hz): D6 (1149.4 Hz, +17¢)
- Baroque pitch (A4 = 415 Hz): D♯6 (1173.8 Hz, -19¢)
The digit sequence 1161 first appears in π at position 7,763 of the decimal expansion (the 7,763ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.