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Number

139

139 is a prime, odd, a calendar year.

Arithmetic Number Ascending Digits Chen Prime Deficient Number Evil Number Happy Number Prime Recamán's Sequence Squarefree Twin Prime Year

Historical context — 139 AD

Calendar year

Year 139 (CXXXIX) was a common year starting on Wednesday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Historical context — 139 BC

Calendar year

Year 139 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

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, 139
Ended on: Thursday
December 31, 139
Friday the 13ths: 3
3 Friday the 13ths this year.
Decade: 130s
130–139
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,887
1887 years before 2026.

In other calendars

Hebrew: 3899 / 3900 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: 682 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 131 / 132 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 61 / 60 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 13
Digit product: 27
Digital root: 4
Palindrome: No
Bit width: 8 bits
Reversed: 931
Recamán's sequence: a(754) = 139
Square (n²): 19,321
Cube (n³): 2,685,619
Divisor count: 2
σ(n) — sum of divisors: 140
φ(n) — Euler's totient: 138

Primality

139 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 139

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 139)

1 × 139

First multiples

139 · 278 (double) · 417 · 556 · 695 · 834 · 973 · 1,112 · 1,251 · 1,390

Sums & aliquot sequence

As consecutive integers: 69 + 70

Representations

In words: one hundred thirty-nine
Ordinal: 139th
Roman numeral: CXXXIX
Binary: 10001011
Octal: 213
Hexadecimal: 0x8B
Base64: iw==
One's complement: 116 (8-bit)

In other bases

ternary (3) 12011

quaternary (4) 2023

quinary (5) 1024

senary (6) 351

septenary (7) 256

nonary (9) 164

undecimal (11) 117

duodecimal (12) b7

tridecimal (13) a9

tetradecimal (14) 9d

pentadecimal (15) 94

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ρλθʹ
Mayan (base 20): 𝋦·𝋳
Chinese: 一百三十九
Chinese (financial): 壹佰參拾玖

In other modern scripts

Eastern Arabic ١٣٩ Devanagari १३९ Bengali ১৩৯ Tamil ௧௩௯ Thai ๑๓๙ Tibetan ༡༣༩ Khmer ១៣៩ Lao ໑໓໙ Burmese ၁၃၉

Digit at this position in famous constants

π — Pi (π): Digit 139 = 1
e — Euler's number (e): Digit 139 = 2
φ — Golden ratio (φ): Digit 139 = 1
√2 — Pythagoras's (√2): Digit 139 = 2
ln 2 — Natural log of 2: Digit 139 = 7
γ — Euler-Mascheroni (γ): Digit 139 = 6

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 137 (gap of 2)
Next prime: 149 (gap of 10)

Pair status: twin with 137.

Unicode codepoint

Partial Line Forward

U+008B

Control character (Cc)

UTF-8 encoding: C2 8B (2 bytes).

Lookup U+008B on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00008B

RGB(0, 0, 139)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.139.

Address: 0.0.0.139
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.139

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