1,125
1,125 is a composite number, odd, a calendar year.
1,125 (one thousand one hundred twenty-five) is an odd 4-digit number. It is a composite number with 12 divisors, and factors as 3² × 5³. Written other ways, in Roman numerals it is MCXXV and in binary, 10001100101.
Interestingness
Historical context — 1125 AD
Calendar year
Year 1125 (MCXXV) was a common year starting on Thursday 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
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1125
- Ended on
-
Thursday
December 31, 1125
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
1120s
1120–1129
- Century
-
12th century
1101–1200
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
901
901 years before 2026.
In other calendars
- Hebrew
-
4885 / 4886 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
518 / 519 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Snake
Sexagenary cycle position 42 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1668 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
503 / 504 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1117 / 1118 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1047 / 1046 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 3 2 × 5 3
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,125 = [33; (1, 1, 5, 1, 1, 2, 7, 16, 1, 1, 1, 2, 1, 6, 1, 2, 1, 1, 1, 16, 7, 2, 1, 1, …)]
Period length 28 — the block in parentheses repeats forever.
Representations
- In words
- one thousand one hundred twenty-five
- Ordinal
- 1125th
- Roman numeral
- MCXXV
- Binary
- 10001100101
- Octal
- 2145
- Hexadecimal
- 0x465
- Base64
- BGU=
- One's complement
- 64,410 (16-bit)
- Scientific notation
- 1.125 × 10³
- As a duration
- 1,125 s = 18 minutes, 45 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵αρκεʹ
- Mayan (base 20)
- 𝋢·𝋰·𝋥
- Chinese
- 一千一百二十五
- Chinese (financial)
- 壹仟壹佰貳拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,125 = 2
- e — Euler's number (e)
- Digit 1,125 = 1
- φ — Golden ratio (φ)
- Digit 1,125 = 3
- √2 — Pythagoras's (√2)
- Digit 1,125 = 4
- ln 2 — Natural log of 2
- Digit 1,125 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,125 = 6
Also seen as
UTF-8 encoding: D1 A5 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.101.
- Address
- 0.0.4.101
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.101
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,125 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C♯6 (1108.7 Hz, +25¢)
- Scientific pitch (C4 = 256 Hz): D6 (1149.4 Hz, -37¢)
- Baroque pitch (A4 = 415 Hz): D6 (1107.9 Hz, +26¢)
The digit sequence 1125 first appears in π at position 1,349 of the decimal expansion (the 1,349ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.