number.wiki

Number

89

89 is a prime, odd, a calendar year.

Arithmetic Number Chen Prime Deficient Number Evil Number Fibonacci Flippable Prime Pythagorean Prime Recamán's Sequence Sexy Prime Sophie Germain Prime Squarefree Year

Historical context — 89 AD

Calendar year

AD 89 (LXXXIX) was a common year starting on Thursday of the Julian calendar.

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

Historical context — 89 BC

Calendar year

Year 89 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: Saturday
January 1, 89
Ended on: Saturday
December 31, 89
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 80s
80–89
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,937
1937 years before 2026.

In other calendars

Hebrew: 3849 / 3850 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Earth zodiac:Ox
Sexagenary cycle position 26 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 632 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 81 / 82 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 11 / 10 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 2
Digit sum: 17
Digit product: 72
Digital root: 8
Palindrome: No
Bit width: 7 bits
Reversed: 98
Flips to (rotate 180°): 68
Recamán's sequence: a(61) = 89
Square (n²): 7,921
Cube (n³): 704,969
Divisor count: 2
σ(n) — sum of divisors: 90
φ(n) — Euler's totient: 88

Primality

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

Divisors & multiples

All divisors (2)

1 · 89

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 89)

1 × 89

First multiples

89 · 178 (double) · 267 · 356 · 445 · 534 · 623 · 712 · 801 · 890

Sums & aliquot sequence

As a sum of two squares: 5² + 8²

As consecutive integers: 44 + 45

Representations

In words: eighty-nine
Ordinal: 89th
Roman numeral: LXXXIX
Binary: 1011001
Octal: 131
Hexadecimal: 0x59
Base64: WQ==
One's complement: 166 (8-bit)

In other bases

ternary (3) 10022

quaternary (4) 1121

quinary (5) 324

senary (6) 225

septenary (7) 155

nonary (9) 108

undecimal (11) 81

duodecimal (12) 75

tridecimal (13) 6b

tetradecimal (14) 65

pentadecimal (15) 5e

Historical numeral systems

Babylonian (base 60): 𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): πθʹ
Mayan (base 20): 𝋤·𝋩
Chinese: 八十九
Chinese (financial): 捌拾玖

In other modern scripts

Eastern Arabic ٨٩ Devanagari ८९ Bengali ৮৯ Tamil ௮௯ Thai ๘๙ Tibetan ༨༩ Khmer ៨៩ Lao ໘໙ Burmese ၈၉

Digit at this position in famous constants

π — Pi (π): Digit 89 = 8
e — Euler's number (e): Digit 89 = 1
φ — Golden ratio (φ): Digit 89 = 2
√2 — Pythagoras's (√2): Digit 89 = 5
ln 2 — Natural log of 2: Digit 89 = 3
γ — Euler-Mascheroni (γ): Digit 89 = 0

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 83 (gap of 6)
Next prime: 97 (gap of 8)

Pair status: sexy with 83.

ASCII character

As an ASCII codepoint, 89 is Y. Printable ASCII character Y.

Hex color

#000059

RGB(0, 0, 89)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.89.

Address: 0.0.0.89
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.89

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

US numbered highway

Matches numbered highway designations:

I-89 — Bow, NH to Highgate, VT (Canadian border).
US 89 — Piegan, MT to Flagstaff, AZ — scenic park-to-park route.

Interstate 89 on Wikipedia ↗ US 89 on Wikipedia ↗