681
+681 is the international calling code for Wallis and Futuna.
- Odd
- Composite
Where 681 fits
Why 681 is special
Wallis and Futuna is a French collectivity in the Pacific that retains three traditional kingdoms alongside the French administration.
Factors & digit properties
- Divisors (4)
- 1, 3, 227, 681
- Prime factorisation
- 3 × 227
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 681
- Scientific notation
- 6.810 × 10^2
Roman numerals
D C L X X X I
Binary
1 0 1 0 1 0 1 0 0 1
1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 681
Octal
1 2 5 1
1 × 512 + 2 × 64 + 5 × 8 + 1 × 1 = 681
Hexadecimal
2 a 9
2 × 256 + a × 16 + 9 × 1 = 681
Read as powers of two: 512 + 128 + 32 + 8 + 1 = 681.
In historical numeral systems
Egyptian
6 coils of rope, 8 hobbles, 1 stroke
6 × 100 + 8 × 10 + 1 × 1 = 681. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 1 vertical wedge (sixties place), 2 corner wedges + 1 vertical wedge (units place)
11 × 60 + 21 = 681. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then pi, then alpha, marked as a numeral
chi-pi-alpha + keraia
chi + pi + alpha written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then resh, then pe, then alef
tav-resh-pe-alef
tav (400) + resh (200) + pe (80) + alef (1) = 681, written in descending order.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
Geography
+681 reaches Wallis and Futuna, where three customary monarchies operate alongside French republican administration.
DocumentedGeographyGeography: Wallis and Futuna
Common questions
Is 681 a prime number?
No, 681 is not prime.
What are the factors of 681?
The factors of 681 are 1, 3, 227, 681.
What is 681 in Roman numerals?
681 in Roman numerals is DCLXXXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026