103
103 is a prime, odd, a calendar year.
103 (one hundred three) is an odd 3-digit number. It is a prime number — divisible only by 1 and itself. Written other ways, in Roman numerals it is CIII and in binary, 1100111.
Interestingness
Historical context — 103 AD
Calendar year
103 (CIII) was a common year starting on Sunday of the Julian calendar.
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Historical context — 103 BC
Calendar year
Year 103 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
-
Monday
January 1, 103
- Ended on
-
Monday
December 31, 103
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
100s
100–109
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,923
1923 years before 2026.
In other calendars
- Hebrew
-
3863 / 3864 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Water zodiac:Rabbit
Sexagenary cycle position 40 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
646 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
95 / 96 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
25 / 24 Saka
Indian national calendar; year starts in March.
Properties
Primality
103 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√103 = [10; (6, 1, 2, 1, 1, 9, 1, 1, 2, 1, 6, 20)]
Period length 12 — the block in parentheses repeats forever.
Representations
- In words
- one hundred three
- Ordinal
- 103rd
- Roman numeral
- CIII
- Binary
- 1100111
- Octal
- 147
- Hexadecimal
- 0x67
- Base64
- Zw==
- One's complement
- 152 (8-bit)
- Scientific notation
- 1.03 × 10²
- As a duration
- 103 s = 1 minute, 43 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓏺𓏺𓏺
- Greek (Milesian)
- ργʹ
- Mayan (base 20)
- 𝋥·𝋣
- Chinese
- 一百零三
- Chinese (financial)
- 壹佰零參
Digit at this position in famous constants
- π — Pi (π)
- Digit 103 = 2
- e — Euler's number (e)
- Digit 103 = 7
- φ — Golden ratio (φ)
- Digit 103 = 4
- √2 — Pythagoras's (√2)
- Digit 103 = 5
- ln 2 — Natural log of 2
- Digit 103 = 2
- γ — Euler-Mascheroni (γ)
- Digit 103 = 4
Also seen as
As an ASCII codepoint, 103 is g. Printable ASCII character g.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.103.
- Address
- 0.0.0.103
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.103
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 103 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯2 (103.8 Hz, -14¢)
- Scientific pitch (C4 = 256 Hz): G♯2 (101.6 Hz, +24¢)
- Baroque pitch (A4 = 415 Hz): A2 (103.8 Hz, -13¢)
As a MIDI note number, 103 is G7 (3136 Hz at concert pitch).
On the periodic table, atomic number 103 is Lawrencium (Lr) — period 7.
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.