689
+689 is the international calling code for French Polynesia.
- Odd
- Composite
Where 689 fits
Why 689 is special
French Polynesia covers an ocean area roughly the size of Europe with a land area smaller than a small county, spread across 118 islands.
Factors & digit properties
- Divisors (4)
- 1, 13, 53, 689
- Prime factorisation
- 13 × 53
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 689
- Scientific notation
- 6.890 × 10^2
Roman numerals
D C L X X X I X
DCLXXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 1 0 1 1 0 0 0 1
1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 689
Octal
1 2 6 1
1 × 512 + 2 × 64 + 6 × 8 + 1 × 1 = 689
Hexadecimal
2 b 1
2 × 256 + b × 16 + 1 × 1 = 689
Read as powers of two: 512 + 128 + 32 + 16 + 1 = 689.
In historical numeral systems
Egyptian
6 coils of rope, 8 hobbles, 9 strokes
6 × 100 + 8 × 10 + 9 × 1 = 689. 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 + 9 vertical wedges (units place)
11 × 60 + 29 = 689. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then pi, then theta, marked as a numeral
chi-pi-theta + keraia
chi + pi + theta 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 tet
tav-resh-pe-tet
tav (400) + resh (200) + pe (80) + tet (9) = 689, 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
Related numbers & connections
French Polynesia and New Caledonia are both French Pacific territories. French Polynesia's 118 islands are scattered across an ocean area comparable in extent to Europe.
View 687 →Other connections
- is associated with687
why?
Strength 0.50, confidence "high".
Geography
+689 reaches French Polynesia, whose 118 islands are scattered across an expanse of ocean comparable in extent to Europe while totalling about 3,500 square km of land.
DocumentedGeographyGeography: French Polynesia
Common questions
Is 689 a prime number?
No, 689 is not prime.
What are the factors of 689?
The factors of 689 are 1, 13, 53, 689.
What is 689 in Roman numerals?
689 in Roman numerals is DCLXXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be DCLXXXVIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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