1,255
1,255 is a composite number, odd, a calendar year.
1,255 (one thousand two hundred fifty-five) is an odd 4-digit number. It is a composite number with 4 divisors, and factors as 5 × 251. Written other ways, in Roman numerals it is MCCLV and in binary, 10011100111.
Interestingness
Historical context — 1255 AD
Calendar year
Year 1255 (MCCLV) was a common year starting on Friday 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
-
Friday
January 1, 1255
- Ended on
-
Friday
December 31, 1255
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1250s
1250–1259
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
771
771 years before 2026.
In other calendars
- Hebrew
-
5015 / 5016 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
652 / 653 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rabbit
Sexagenary cycle position 52 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1798 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
633 / 634 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1247 / 1248 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1177 / 1176 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 251
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,255 = [35; (2, 2, 1, 7, 6, 3, 4, 1, 2, 1, 11, 14, 11, 1, 2, 1, 4, 3, 6, 7, 1, 2, 2, 70)]
Period length 24 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred fifty-five
- Ordinal
- 1255th
- Roman numeral
- MCCLV
- Binary
- 10011100111
- Octal
- 2347
- Hexadecimal
- 0x4E7
- Base64
- BOc=
- One's complement
- 64,280 (16-bit)
- Scientific notation
- 1.255 × 10³
- As a duration
- 1,255 s = 20 minutes, 55 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασνεʹ
- Mayan (base 20)
- 𝋣·𝋢·𝋯
- Chinese
- 一千二百五十五
- Chinese (financial)
- 壹仟貳佰伍拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,255 = 8
- e — Euler's number (e)
- Digit 1,255 = 5
- φ — Golden ratio (φ)
- Digit 1,255 = 3
- √2 — Pythagoras's (√2)
- Digit 1,255 = 7
- ln 2 — Natural log of 2
- Digit 1,255 = 8
- γ — Euler-Mascheroni (γ)
- Digit 1,255 = 2
Also seen as
UTF-8 encoding: D3 A7 (2 bytes).
Code page 1255 is Windows-1255 (Hebrew) — Microsoft Windows encoding for Hebrew.
Code pages are integer identifiers used by Windows and other systems to refer to specific character encodings.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.231.
- Address
- 0.0.4.231
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.231
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,255 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯6 (1244.5 Hz, +15¢)
- Scientific pitch (C4 = 256 Hz): E6 (1290.2 Hz, -48¢ — about midway to D♯6)
- Baroque pitch (A4 = 415 Hz): E6 (1243.6 Hz, +16¢)
The digit sequence 1255 first appears in π at position 4,414 of the decimal expansion (the 4,414ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.