199
199 is a prime, odd, a calendar year.
199 (one hundred ninety-nine) is an odd 3-digit number. It is a prime number — divisible only by 1 and itself. It is a Lucas number. Written other ways, in Roman numerals it is CXCIX and in binary, 11000111.
Interestingness
Historical context — 199 AD
Calendar year
Year 199 (CXCIX) was a common year starting on Monday of the Julian calendar.
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Historical context — 199 BC
Calendar year
Year 199 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
- 52
- Started on
-
Tuesday
January 1, 199
- Ended on
-
Tuesday
December 31, 199
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
190s
190–199
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,827
1827 years before 2026.
In other calendars
- Hebrew
-
3959 / 3960 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Earth zodiac:Rabbit
Sexagenary cycle position 16 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
742 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
191 / 192 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
121 / 120 Saka
Indian national calendar; year starts in March.
Properties
Primality
199 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√199 = [14; (9, 2, 1, 2, 2, 5, 4, 1, 1, 13, 1, 1, 4, 5, 2, 2, 1, 2, 9, 28)]
Period length 20 — the block in parentheses repeats forever.
Representations
- In words
- one hundred ninety-nine
- Ordinal
- 199th
- Roman numeral
- CXCIX
- Binary
- 11000111
- Octal
- 307
- Hexadecimal
- 0xC7
- Base64
- xw==
- One's complement
- 56 (8-bit)
- Scientific notation
- 1.99 × 10²
- As a duration
- 199 s = 3 minutes, 19 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρϟθʹ
- Mayan (base 20)
- 𝋩·𝋳
- Chinese
- 一百九十九
- Chinese (financial)
- 壹佰玖拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 199 = 1
- e — Euler's number (e)
- Digit 199 = 9
- φ — Golden ratio (φ)
- Digit 199 = 7
- √2 — Pythagoras's (√2)
- Digit 199 = 1
- ln 2 — Natural log of 2
- Digit 199 = 3
- γ — Euler-Mascheroni (γ)
- Digit 199 = 4
Also seen as
UTF-8 encoding: C3 87 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.199.
- Address
- 0.0.0.199
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.199
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 199 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G3 (196 Hz, +26¢)
- Scientific pitch (C4 = 256 Hz): G♯3 (203.2 Hz, -36¢)
- Baroque pitch (A4 = 415 Hz): G♯3 (195.9 Hz, +28¢)
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.