1,229
1,229 is a prime, odd, a calendar year.
1,229 (one thousand two hundred twenty-nine) 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 MCCXXIX and in binary, 10011001101.
Interestingness
Historical context — 1229 AD
Calendar year
Year 1229 (MCCXXIX) 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, 1229
- Ended on
-
Monday
December 31, 1229
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1220s
1220–1229
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
797
797 years before 2026.
In other calendars
- Hebrew
-
4989 / 4990 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
626 / 627 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1772 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
607 / 608 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1221 / 1222 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1151 / 1150 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,229 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,229 = [35; (17, 1, 1, 17, 70)]
Period length 5 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred twenty-nine
- Ordinal
- 1229th
- Roman numeral
- MCCXXIX
- Binary
- 10011001101
- Octal
- 2315
- Hexadecimal
- 0x4CD
- Base64
- BM0=
- One's complement
- 64,306 (16-bit)
- Scientific notation
- 1.229 × 10³
- As a duration
- 1,229 s = 20 minutes, 29 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασκθʹ
- Mayan (base 20)
- 𝋣·𝋡·𝋩
- Chinese
- 一千二百二十九
- Chinese (financial)
- 壹仟貳佰貳拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,229 = 9
- e — Euler's number (e)
- Digit 1,229 = 0
- φ — Golden ratio (φ)
- Digit 1,229 = 1
- √2 — Pythagoras's (√2)
- Digit 1,229 = 9
- ln 2 — Natural log of 2
- Digit 1,229 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,229 = 1
Also seen as
UTF-8 encoding: D3 8D (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.205.
- Address
- 0.0.4.205
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.205
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,229 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D♯6 (1244.5 Hz, -22¢)
- Scientific pitch (C4 = 256 Hz): D♯6 (1217.7 Hz, +16¢)
- Baroque pitch (A4 = 415 Hz): E6 (1243.6 Hz, -20¢)
The digit sequence 1229 first appears in π at position 30,417 of the decimal expansion (the 30,417ordinal-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.
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.