1,121
1,121 is a composite number, odd, a calendar year.
1,121 (one thousand one hundred twenty-one) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 19 × 59. Written other ways, in Roman numerals it is MCXXI and in binary, 10001100001.
Interestingness
Historical context — 1121 AD
Calendar year
Year 1121 (MCXXI) 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, 1121
- Ended on
-
Saturday
December 31, 1121
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1120s
1120–1129
- Century
-
12th century
1101–1200
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
905
905 years before 2026.
In other calendars
- Hebrew
-
4881 / 4882 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
514 / 515 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Ox
Sexagenary cycle position 38 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1664 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
499 / 500 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1113 / 1114 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1043 / 1042 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 19 × 59
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,121 = [33; (2, 12, 1, 8, 1, 1, 1, 3, 1, 1, 7, 1, 4, 3, 1, 2, 1, 3, 4, 1, 7, 1, 1, 3, …)]
Period length 32 — the block in parentheses repeats forever.
Representations
- In words
- one thousand one hundred twenty-one
- Ordinal
- 1121st
- Roman numeral
- MCXXI
- Binary
- 10001100001
- Octal
- 2141
- Hexadecimal
- 0x461
- Base64
- BGE=
- One's complement
- 64,414 (16-bit)
- Scientific notation
- 1.121 × 10³
- As a duration
- 1,121 s = 18 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓎆𓎆𓏺
- Greek (Milesian)
- ͵αρκαʹ
- Mayan (base 20)
- 𝋢·𝋰·𝋡
- Chinese
- 一千一百二十一
- Chinese (financial)
- 壹仟壹佰貳拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,121 = 9
- e — Euler's number (e)
- Digit 1,121 = 8
- φ — Golden ratio (φ)
- Digit 1,121 = 7
- √2 — Pythagoras's (√2)
- Digit 1,121 = 0
- ln 2 — Natural log of 2
- Digit 1,121 = 3
- γ — Euler-Mascheroni (γ)
- Digit 1,121 = 2
Also seen as
UTF-8 encoding: D1 A1 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.97.
- Address
- 0.0.4.97
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.97
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,121 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯6 (1108.7 Hz, +19¢)
- Scientific pitch (C4 = 256 Hz): D6 (1149.4 Hz, -43¢)
- Baroque pitch (A4 = 415 Hz): D6 (1107.9 Hz, +20¢)
The digit sequence 1121 first appears in π at position 709 of the decimal expansion (the 709ordinal-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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.