201
201 is a composite number, odd, a calendar year.
201 (two hundred one) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 3 × 67. Written other ways, in Roman numerals it is CCI and in binary, 11001001.
Interestingness
Historical context — 201 AD
Calendar year
Year 201 (CCI) was a common year starting on Thursday of the Julian calendar.
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Historical context — 201 BC
Calendar year
Year 201 BC was a year of the pre-Julian Roman 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, 201
- Ended on
-
Thursday
December 31, 201
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
200s
200–209
- Century
-
3rd century
201–300
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,825
1825 years before 2026.
In other calendars
- Hebrew
-
3961 / 3962 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Metal zodiac:Snake
Sexagenary cycle position 18 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
744 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
193 / 194 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
123 / 122 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 3 × 67
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√201 = [14; (5, 1, 1, 1, 2, 1, 8, 1, 2, 1, 1, 1, 5, 28)]
Period length 14 — the block in parentheses repeats forever.
Representations
- In words
- two hundred one
- Ordinal
- 201st
- Roman numeral
- CCI
- Binary
- 11001001
- Octal
- 311
- Hexadecimal
- 0xC9
- Base64
- yQ==
- One's complement
- 54 (8-bit)
- Scientific notation
- 2.01 × 10²
- As a duration
- 201 s = 3 minutes, 21 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓏺
- Greek (Milesian)
- σαʹ
- Mayan (base 20)
- 𝋪·𝋡
- Chinese
- 二百零一
- Chinese (financial)
- 貳佰零壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 201 = 6
- e — Euler's number (e)
- Digit 201 = 1
- φ — Golden ratio (φ)
- Digit 201 = 8
- √2 — Pythagoras's (√2)
- Digit 201 = 7
- ln 2 — Natural log of 2
- Digit 201 = 5
- γ — Euler-Mascheroni (γ)
- Digit 201 = 1
Also seen as
UTF-8 encoding: C3 89 (2 bytes).
HTTP 201 Created — Request succeeded and a new resource was created.
2xx class: Success.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.201.
- Address
- 0.0.0.201
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.201
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 201 is an active NANP area code (North American Numbering Plan).
- Primary area
- Jersey City
- Region
- New Jersey
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
Heard as a frequency, 201 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G3 (196 Hz, +44¢)
- Scientific pitch (C4 = 256 Hz): G♯3 (203.2 Hz, -19¢)
- Baroque pitch (A4 = 415 Hz): G♯3 (195.9 Hz, +45¢ — about midway to A3)
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.