Number

115

115 is a composite number, odd, a calendar year.

Arithmetic Number Deficient Number Odious Number Pernicious Number Recamán's Sequence Semiprime Squarefree Year Zuckerman Number

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

Parity: Odd
Digit count: 3
Digit sum: 7
Digit product: 5
Digital root: 7
Palindrome: No
Bit width: 7 bits
Reversed: 511
Recamán's sequence: a(170) = 115
Square (n²): 13,225
Cube (n³): 1,520,875
Divisor count: 4
σ(n) — sum of divisors: 144
φ(n) — Euler's totient: 88
Sum of prime factors: 28

Primality

Prime factorization: 5 × 23

Nearest primes: 113 (−2) · 127 (+12)

Divisors & multiples

All divisors (4)

1 · 5 · 23 · 115

Aliquot sum (sum of proper divisors): 29

Factor pairs (a × b = 115)

1 × 115

5 × 23

First multiples

115 · 230 (double) · 345 · 460 · 575 · 690 · 805 · 920 · 1,035 · 1,150

Sums & aliquot sequence

As consecutive integers: 57 + 58 21 + 22 + 23 + 24 + 25 7 + 8 + … + 16

Aliquot sequence: 115 → 29 → 1 → 0 — terminates at zero

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)

In other bases

ternary (3) 11021

quaternary (4) 1303

quinary (5) 430

senary (6) 311

septenary (7) 223

nonary (9) 137

undecimal (11) a5

duodecimal (12) 97

tridecimal (13) 8b

tetradecimal (14) 83

pentadecimal (15) 7a

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

In other modern scripts

Eastern Arabic ١١٥ Devanagari ११५ Bengali ১১৫ Tamil ௧௧௫ Thai ๑๑๕ Tibetan ༡༡༥ Khmer ១១៥ Lao ໑໑໕ Burmese ၁၁၅

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

ASCII character

As an ASCII codepoint, 115 is s. Printable ASCII character s.

Hex color

#000073

RGB(0, 0, 115)

IPv4 address

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.