1,201
1,201 is a prime, odd, a calendar year.
1,201 (one thousand two hundred one) 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 MCCI and in binary, 10010110001.
Interestingness
Historical context — 1201 AD
Calendar year
Year 1201 (MCCI) 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, 1201
- Ended on
-
Monday
December 31, 1201
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
1200s
1200–1209
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
825
825 years before 2026.
In other calendars
- Hebrew
-
4961 / 4962 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
597 / 598 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Rooster
Sexagenary cycle position 58 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1744 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
579 / 580 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1193 / 1194 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1123 / 1122 Saka
Indian national calendar; year starts in March.
Properties
Primality
1,201 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√1,201 = [34; (1, 1, 1, 9, 4, 4, 2, 1, 1, 1, 7, 13, 1, 2, 1, 2, 1, 1, 4, 22, 1, 7, 1, 2, …)]
Period length 51 — the block in parentheses repeats forever.
Representations
- In words
- one thousand two hundred one
- Ordinal
- 1201st
- Roman numeral
- MCCI
- Binary
- 10010110001
- Octal
- 2261
- Hexadecimal
- 0x4B1
- Base64
- BLE=
- One's complement
- 64,334 (16-bit)
- Scientific notation
- 1.201 × 10³
- As a duration
- 1,201 s = 20 minutes, 1 second
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓏺
- Greek (Milesian)
- ͵ασαʹ
- Mayan (base 20)
- 𝋣·𝋠·𝋡
- Chinese
- 一千二百零一
- Chinese (financial)
- 壹仟貳佰零壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,201 = 2
- e — Euler's number (e)
- Digit 1,201 = 9
- φ — Golden ratio (φ)
- Digit 1,201 = 2
- √2 — Pythagoras's (√2)
- Digit 1,201 = 6
- ln 2 — Natural log of 2
- Digit 1,201 = 2
- γ — Euler-Mascheroni (γ)
- Digit 1,201 = 4
Also seen as
UTF-8 encoding: D2 B1 (2 bytes).
Code page 1201 is UTF-16 BE — Big-endian UTF-16.
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 0.0.4.177.
- Address
- 0.0.4.177
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.177
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 1,201 Hz is closest to:
- Concert pitch (A4 = 440 Hz): D6 (1174.7 Hz, +38¢)
- Scientific pitch (C4 = 256 Hz): D♯6 (1217.7 Hz, -24¢)
- Baroque pitch (A4 = 415 Hz): D♯6 (1173.8 Hz, +40¢)
The digit sequence 1201 first appears in π at position 243 of the decimal expansion (the 243ordinal-suffix:rd 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.