1,155
1,155 is a composite number, odd, a calendar year.
Historical context — 1155 AD
Calendar year
Year 1155 (MCLV) was a common year starting on Saturday 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
-
Saturday
January 1, 1155
- Ended on
-
Saturday
December 31, 1155
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1150s
1150–1159
- Century
-
12th century
1101–1200
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
871
871 years before 2026.
In other calendars
- Hebrew
-
4915 / 4916 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
549 / 550 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Pig
Sexagenary cycle position 12 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1698 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
533 / 534 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1147 / 1148 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1077 / 1076 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 12
- Digit product
- 25
- Digital root
- 3
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,511
- Recamán's sequence
- a(1,862) = 1,155
- Square (n²)
- 1,334,025
- Cube (n³)
- 1,540,798,875
- Divisor count
- 16
- σ(n) — sum of divisors
- 2,304
- φ(n) — Euler's totient
- 480
- Sum of prime factors
- 26
Primality
Prime factorization: 3 × 5 × 7 × 11
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand one hundred fifty-five
- Ordinal
- 1155th
- Roman numeral
- MCLV
- Binary
- 10010000011
- Octal
- 2203
- Hexadecimal
- 0x483
- Base64
- BIM=
- One's complement
- 64,380 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αρνεʹ
- Mayan (base 20)
- 𝋢·𝋱·𝋯
- Chinese
- 一千一百五十五
- Chinese (financial)
- 壹仟壹佰伍拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,155 = 5
- e — Euler's number (e)
- Digit 1,155 = 0
- φ — Golden ratio (φ)
- Digit 1,155 = 9
- √2 — Pythagoras's (√2)
- Digit 1,155 = 5
- ln 2 — Natural log of 2
- Digit 1,155 = 5
- γ — Euler-Mascheroni (γ)
- Digit 1,155 = 3
Also seen as
UTF-8 encoding: D2 83 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.131.
- Address
- 0.0.4.131
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.131
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1155 first appears in π at position 21,288 of the decimal expansion (the 21,288ordinal-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.