115
115 is a composite number, odd, a calendar year.
115 (one hundred fifteen) is an odd 3-digit number. It is a composite number with 4 divisors, and factors as 5 × 23. Written other ways, in Roman numerals it is CXV and in binary, 1110011.
Interestingness
Historical context — 115 AD
Calendar year
Year 115 (CXV) was a common year starting on Monday of the Julian calendar.
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Historical context — 115 BC
Calendar year
Year 115 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, 115
- Ended on
-
Tuesday
December 31, 115
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
110s
110–119
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,911
1911 years before 2026.
In other calendars
- Hebrew
-
3875 / 3876 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Wood zodiac:Rabbit
Sexagenary cycle position 52 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
658 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
107 / 108 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
37 / 36 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 5 × 23
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√115 = [10; (1, 2, 1, 1, 1, 1, 1, 2, 1, 20)]
Period length 10 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifteen
- Ordinal
- 115th
- Roman numeral
- CXV
- Binary
- 1110011
- Octal
- 163
- Hexadecimal
- 0x73
- Base64
- cw==
- One's complement
- 140 (8-bit)
- Scientific notation
- 1.15 × 10²
- As a duration
- 115 s = 1 minute, 55 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ριεʹ
- Mayan (base 20)
- 𝋥·𝋯
- Chinese
- 一百一十五
- Chinese (financial)
- 壹佰壹拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 115 = 2
- e — Euler's number (e)
- Digit 115 = 3
- φ — Golden ratio (φ)
- Digit 115 = 6
- √2 — Pythagoras's (√2)
- Digit 115 = 2
- ln 2 — Natural log of 2
- Digit 115 = 0
- γ — Euler-Mascheroni (γ)
- Digit 115 = 7
Also seen as
As an ASCII codepoint, 115 is s. Printable ASCII character s.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.115.
- Address
- 0.0.0.115
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.115
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 115 Hz is closest to:
- Concert pitch (A4 = 440 Hz): A♯2 (116.5 Hz, -23¢)
- Scientific pitch (C4 = 256 Hz): A♯2 (114 Hz, +15¢)
- Baroque pitch (A4 = 415 Hz): B2 (116.5 Hz, -22¢)
As a MIDI note number, 115 is G8 (6271.9 Hz at concert pitch).
On the periodic table, atomic number 115 is Moscovium (Mc) — period 7.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.