Number

159

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

Arithmetic Number Ascending Digits Deficient Number Evil Number Recamán's Sequence Semiprime Squarefree Stepped Digits Woodall Number Year

Historical context — 159 AD

Calendar year

Year 159 (CLIX) was a common year starting on Sunday of the Julian calendar.

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Historical context — 159 BC

Calendar year

Year 159 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, 159
Ended on: Monday
December 31, 159
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 150s
150–159
Century: 2nd century
101–200
Millennium: 1st millennium
1–1000
Years ago: 1,867
1867 years before 2026.

In other calendars

Hebrew: 3919 / 3920 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Pig
Sexagenary cycle position 36 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 702 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 151 / 152 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 81 / 80 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 15
Digit product: 45
Digital root: 6
Palindrome: No
Bit width: 8 bits
Reversed: 951
Recamán's sequence: a(90) = 159
Square (n²): 25,281
Cube (n³): 4,019,679
Divisor count: 4
σ(n) — sum of divisors: 216
φ(n) — Euler's totient: 104
Sum of prime factors: 56

Primality

Prime factorization: 3 × 53

Nearest primes: 157 (−2) · 163 (+4)

Divisors & multiples

All divisors (4)

1 · 3 · 53 · 159

Aliquot sum (sum of proper divisors): 57

Factor pairs (a × b = 159)

1 × 159

3 × 53

First multiples

159 · 318 (double) · 477 · 636 · 795 · 954 · 1,113 · 1,272 · 1,431 · 1,590

Sums & aliquot sequence

As consecutive integers: 79 + 80 52 + 53 + 54 24 + 25 + 26 + 27 + 28 + 29

Aliquot sequence: 159 → 57 → 23 → 1 → 0 — terminates at zero

Representations

In words: one hundred fifty-nine
Ordinal: 159th
Roman numeral: CLIX
Binary: 10011111
Octal: 237
Hexadecimal: 0x9F
Base64: nw==
One's complement: 96 (8-bit)

In other bases

ternary (3) 12220

quaternary (4) 2133

quinary (5) 1114

senary (6) 423

septenary (7) 315

nonary (9) 186

undecimal (11) 135

duodecimal (12) 113

tridecimal (13) c3

tetradecimal (14) b5

pentadecimal (15) a9

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ρνθʹ
Mayan (base 20): 𝋧·𝋳
Chinese: 一百五十九
Chinese (financial): 壹佰伍拾玖

In other modern scripts

Eastern Arabic ١٥٩ Devanagari १५९ Bengali ১৫৯ Tamil ௧௫௯ Thai ๑๕๙ Tibetan ༡༥༩ Khmer ១៥៩ Lao ໑໕໙ Burmese ၁၅၉

Digit at this position in famous constants

π — Pi (π): Digit 159 = 5
e — Euler's number (e): Digit 159 = 3
φ — Golden ratio (φ): Digit 159 = 3
√2 — Pythagoras's (√2): Digit 159 = 1
ln 2 — Natural log of 2: Digit 159 = 3
γ — Euler-Mascheroni (γ): Digit 159 = 5

Also seen as

Unicode codepoint

Application Program Command

U+009F

Control character (Cc)

UTF-8 encoding: C2 9F (2 bytes).

Lookup U+009F on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#00009F

RGB(0, 0, 159)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.159.

Address: 0.0.0.159
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.159

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