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Number

689

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

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

Historical context — 689 AD

Calendar year

Year 689 (DCLXXXIX) was a common year starting on Friday of the Julian calendar.

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Historical context — 689 BC

Decade

This article concerns the period 689 BC – 680 BC.

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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: Tuesday
January 1, 689
Ended on: Tuesday
December 31, 689
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 680s
680–689
Century: 7th century
601–700
Millennium: 1st millennium
1–1000
Years ago: 1,337
1337 years before 2026.

In other calendars

Hebrew: 4449 / 4450 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 69 / 70 AH
Lunar calendar; year spans differ from Gregorian.
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: 1232 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 67 / 68 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 681 / 682 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 611 / 610 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 23
Digit product: 432
Digital root: 5
Palindrome: No
Bit width: 10 bits
Reversed: 986
Recamán's sequence: a(2,246) = 689
Square (n²): 474,721
Cube (n³): 327,082,769
Divisor count: 4
σ(n) — sum of divisors: 756
φ(n) — Euler's totient: 624
Sum of prime factors: 66

Primality

Prime factorization: 13 × 53

Nearest primes: 683 (−6) · 691 (+2)

Divisors & multiples

All divisors (4)

1 · 13 · 53 · 689

Aliquot sum (sum of proper divisors): 67

Factor pairs (a × b = 689)

1 × 689

13 × 53

First multiples

689 · 1,378 (double) · 2,067 · 2,756 · 3,445 · 4,134 · 4,823 · 5,512 · 6,201 · 6,890

Sums & aliquot sequence

As a sum of two squares: 8² + 25² = 17² + 20²

As consecutive integers: 344 + 345 47 + 48 + … + 59 14 + 15 + … + 39

Aliquot sequence: 689 → 67 → 1 → 0 — terminates at zero

Representations

In words: six hundred eighty-nine
Ordinal: 689th
Roman numeral: DCLXXXIX
Binary: 1010110001
Octal: 1261
Hexadecimal: 0x2B1
Base64: ArE=
One's complement: 64,846 (16-bit)

In other bases

ternary (3) 221112

quaternary (4) 22301

quinary (5) 10224

senary (6) 3105

septenary (7) 2003

nonary (9) 845

undecimal (11) 577

duodecimal (12) 495

tridecimal (13) 410

tetradecimal (14) 373

pentadecimal (15) 30e

Historical numeral systems

Babylonian (base 60): 𒌋𒁹 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): χπθʹ
Mayan (base 20): 𝋡·𝋮·𝋩
Chinese: 六百八十九
Chinese (financial): 陸佰捌拾玖

In other modern scripts

Eastern Arabic ٦٨٩ Devanagari ६८९ Bengali ৬৮৯ Tamil ௬௮௯ Thai ๖๘๙ Tibetan ༦༨༩ Khmer ៦៨៩ Lao ໖໘໙ Burmese ၆၈၉

Digit at this position in famous constants

π — Pi (π): Digit 689 = 2
e — Euler's number (e): Digit 689 = 3
φ — Golden ratio (φ): Digit 689 = 9
√2 — Pythagoras's (√2): Digit 689 = 4
ln 2 — Natural log of 2: Digit 689 = 0
γ — Euler-Mascheroni (γ): Digit 689 = 7

Also seen as

Unicode codepoint

ʱ

Modifier Letter Small H With Hook

U+02B1

Modifier letter (Lm)

UTF-8 encoding: CA B1 (2 bytes).

Lookup U+02B1 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0002B1

RGB(0, 2, 177)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.177.

Address: 0.0.2.177
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.2.177

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