1,123
1,123 is a prime, odd, a calendar year.
1,123 (one thousand one hundred twenty-three) is an odd 4-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is MCXXIII and in binary, 10001100011.
Interestingness
Historical context — 1123 AD
Calendar year
Year 1123 (MCXXIII) was a common year starting on Monday 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
-
Monday
January 1, 1123
- Ended on
-
Monday
December 31, 1123
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1120s
1120–1129
- Century
-
12th century
1101–1200
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
903
903 years before 2026.
In other calendars
- Hebrew
-
4883 / 4884 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
516 / 517 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Rabbit
Sexagenary cycle position 40 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1666 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
501 / 502 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1115 / 1116 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1045 / 1044 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,123 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,123 = [33; (1, 1, 21, 1, 5, 7, 3, 1, 1, 2, 2, 10, 1, 3, 33, 3, 1, 10, 2, 2, 1, 1, 3, 7, …)]
Period length 30 — the block in parentheses repeats forever.
Representations
- In words
- one thousand one hundred twenty-three
- Ordinal
- 1123rd
- Roman numeral
- MCXXIII
- Binary
- 10001100011
- Octal
- 2143
- Hexadecimal
- 0x463
- Base64
- BGM=
- One's complement
- 64,412 (16-bit)
- Scientific notation
- 1.123 × 10³
- As a duration
- 1,123 s = 18 minutes, 43 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵αρκγʹ
- Mayan (base 20)
- 𝋢·𝋰·𝋣
- Chinese
- 一千一百二十三
- Chinese (financial)
- 壹仟壹佰貳拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,123 = 0
- e — Euler's number (e)
- Digit 1,123 = 4
- φ — Golden ratio (φ)
- Digit 1,123 = 8
- √2 — Pythagoras's (√2)
- Digit 1,123 = 1
- ln 2 — Natural log of 2
- Digit 1,123 = 5
- γ — Euler-Mascheroni (γ)
- Digit 1,123 = 5
Also seen as
UTF-8 encoding: D1 A3 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.99.
- Address
- 0.0.4.99
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.99
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,123 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯6 (1108.7 Hz, +22¢)
- Scientific pitch (C4 = 256 Hz): D6 (1149.4 Hz, -40¢)
- Baroque pitch (A4 = 415 Hz): D6 (1107.9 Hz, +23¢)
The digit sequence 1123 first appears in π at position 6,547 of the decimal expansion (the 6,547ordinal-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.
Related reading
- Prime numbers — The building blocks of arithmetic: what primes are, why they matter, and how we find them.
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.