Number

158

158 is a composite number, even, a calendar year.

Arithmetic Number Ascending Digits Deficient Number Odious Number Pernicious Number Perrin Number Recamán's Sequence Semiprime Squarefree Year

Historical context — 158 AD

Calendar year

Year 158 (CLVIII) was a common year starting on Saturday of the Julian calendar.

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Historical context — 158 BC

Calendar year

The Year 158 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: 52
Started on: Sunday
January 1, 158
Ended on: Sunday
December 31, 158
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: 1,868
1868 years before 2026.

In other calendars

Hebrew: 3918 / 3919 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Dog
Sexagenary cycle position 35 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 701 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 150 / 151 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 80 / 79 Saka
Indian national calendar; year starts in March.

Properties

Parity: Even
Digit count: 3
Digit sum: 14
Digit product: 40
Digital root: 5
Palindrome: No
Bit width: 8 bits
Reversed: 851
Recamán's sequence: a(88) = 158
Square (n²): 24,964
Cube (n³): 3,944,312
Divisor count: 4
σ(n) — sum of divisors: 240
φ(n) — Euler's totient: 78
Sum of prime factors: 81

Primality

Prime factorization: 2 × 79

Nearest primes: 157 (−1) · 163 (+5)

Divisors & multiples

All divisors (4)

1 · 2 · 79 (half) · 158

Aliquot sum (sum of proper divisors): 82

Factor pairs (a × b = 158)

1 × 158

2 × 79

First multiples

158 · 316 (double) · 474 · 632 · 790 · 948 · 1,106 · 1,264 · 1,422 · 1,580

Sums & aliquot sequence

As consecutive integers: 38 + 39 + 40 + 41

Aliquot sequence: 158 → 82 → 44 → 40 → 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: one hundred fifty-eight
Ordinal: 158th
Roman numeral: CLVIII
Binary: 10011110
Octal: 236
Hexadecimal: 0x9E
Base64: ng==
One's complement: 97 (8-bit)

In other bases

ternary (3) 12212

quaternary (4) 2132

quinary (5) 1113

senary (6) 422

septenary (7) 314

nonary (9) 185

undecimal (11) 134

duodecimal (12) 112

tridecimal (13) c2

tetradecimal (14) b4

pentadecimal (15) a8

Historical numeral systems

Babylonian (base 60): 𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ρνηʹ
Mayan (base 20): 𝋧·𝋲
Chinese: 一百五十八
Chinese (financial): 壹佰伍拾捌

In other modern scripts

Eastern Arabic ١٥٨ Devanagari १५८ Bengali ১৫৮ Tamil ௧௫௮ Thai ๑๕๘ Tibetan ༡༥༨ Khmer ១៥៨ Lao ໑໕໘ Burmese ၁၅၈

Digit at this position in famous constants

π — Pi (π): Digit 158 = 4
e — Euler's number (e): Digit 158 = 7
φ — Golden ratio (φ): Digit 158 = 4
√2 — Pythagoras's (√2): Digit 158 = 4
ln 2 — Natural log of 2: Digit 158 = 9
γ — Euler-Mascheroni (γ): Digit 158 = 2

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 158, here are decompositions:

7 + 151 = 158
19 + 139 = 158
31 + 127 = 158
61 + 97 = 158
79 + 79 = 158

Unicode codepoint

Privacy Message

U+009E

Control character (Cc)

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

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

Hex color

#00009E

RGB(0, 0, 158)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.158.

Address: 0.0.0.158
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.158

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