Number

111

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

Arithmetic Number Deficient Number Evil Number Flippable Harshad / Niven Nonagonal Palindrome Recamán's Sequence Repdigit Repunit Semiprime Squarefree Strobogrammatic Year Zuckerman Number

Historical context — 111 AD

Calendar year

Year 111 (CXI) was a common year starting on Wednesday of the Julian calendar.

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Historical context — 111 BC

Calendar year

Year 111 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, 111
Ended on: Thursday
December 31, 111
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 110s
110–119
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,915
1915 years before 2026.

In other calendars

Hebrew: 3871 / 3872 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Pig
Sexagenary cycle position 48 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 654 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 103 / 104 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 33 / 32 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 3
Digit product: 1
Digital root: 3
Palindrome: Yes
Bit width: 7 bits
Recamán's sequence: a(770) = 111
Square (n²): 12,321
Cube (n³): 1,367,631
Divisor count: 4
σ(n) — sum of divisors: 152
φ(n) — Euler's totient: 72
Sum of prime factors: 40

Primality

Prime factorization: 3 × 37

Nearest primes: 109 (−2) · 113 (+2)

Divisors & multiples

All divisors (4)

1 · 3 · 37 · 111

Aliquot sum (sum of proper divisors): 41

Factor pairs (a × b = 111)

1 × 111

3 × 37

First multiples

111 · 222 (double) · 333 · 444 · 555 · 666 · 777 · 888 · 999 · 1,110

Sums & aliquot sequence

As consecutive integers: 55 + 56 36 + 37 + 38 16 + 17 + 18 + 19 + 20 + 21

Aliquot sequence: 111 → 41 → 1 → 0 — terminates at zero

Representations

In words: one hundred eleven
Ordinal: 111th
Roman numeral: CXI
Binary: 1101111
Octal: 157
Hexadecimal: 0x6F
Base64: bw==
One's complement: 144 (8-bit)

In other bases

ternary (3) 11010

quaternary (4) 1233

quinary (5) 421

senary (6) 303

septenary (7) 216

nonary (9) 133

undecimal (11) a1

duodecimal (12) 93

tridecimal (13) 87

tetradecimal (14) 7d

pentadecimal (15) 76

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
Egyptian hieroglyphic: 𓍢𓎆𓏺
Greek (Milesian): ριαʹ
Mayan (base 20): 𝋥·𝋫
Chinese: 一百一十一
Chinese (financial): 壹佰壹拾壹

In other modern scripts

Eastern Arabic ١١١ Devanagari १११ Bengali ১১১ Tamil ௧௧௧ Thai ๑๑๑ Tibetan ༡༡༡ Khmer ១១១ Lao ໑໑໑ Burmese ၁၁၁

Digit at this position in famous constants

π — Pi (π): Digit 111 = 1
e — Euler's number (e): Digit 111 = 3
φ — Golden ratio (φ): Digit 111 = 7
√2 — Pythagoras's (√2): Digit 111 = 3
ln 2 — Natural log of 2: Digit 111 = 2
γ — Euler-Mascheroni (γ): Digit 111 = 4

Also seen as

ASCII character

As an ASCII codepoint, 111 is o. Printable ASCII character o.

Hex color

#00006F

RGB(0, 0, 111)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.111.

Address: 0.0.0.111
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.111

Unspecified address (0.0.0.0/8) — "this network" placeholder.