509
+509 is the international calling code for Haiti.
- Odd
- Prime
Where 509 fits
Why 509 is special
Haiti was the first state founded by a successful revolt of enslaved people, and was required to pay France reparations for lost 'property' — a debt it serviced into the twentieth century.
509 is part of
Factors & digit properties
- Divisors (2)
- 1, 509
- Prime factorisation
- 509
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 509
- Scientific notation
- 5.090 × 10^2
Roman numerals
D I X
DIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 1 1 1 1 1 1 0 1
1 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 509
Octal
7 7 5
7 × 64 + 7 × 8 + 5 × 1 = 509
Hexadecimal
1 f d
1 × 256 + f × 16 + d × 1 = 509
Read as powers of two: 256 + 128 + 64 + 32 + 16 + 8 + 4 + 1 = 509.
In historical numeral systems
Egyptian
5 coils of rope, 9 strokes
5 × 100 + 9 × 1 = 509. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
8 vertical wedges (sixties place), 2 corner wedges + 9 vertical wedges (units place)
8 × 60 + 29 = 509. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
phi, then theta, marked as a numeral
phi-theta + keraia
phi + 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 qof, then tet
tav-qof-tet
tav (400) + qof (100) + tet (9) = 509, 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
- Sophie Germain prime
Related numbers & connections
Haiti's calling code and the year it became the first state founded by a successful revolt of enslaved people. It paid France an indemnity for its own independence until 1947.
View 1804 →Other connections
- is associated with1804
why?
Strength 0.50, confidence "high".
Geography
+509 reaches Haiti, which paid France an indemnity for its own independence from 1825 and finished servicing the resulting debt in 1947.
DocumentedGeographyGeography: Haiti
Common questions
Is 509 a prime number?
Yes, 509 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 509?
The factors of 509 are 1, 509.
What is 509 in Roman numerals?
509 in Roman numerals is DIX. IX is subtractive: one before ten — ten minus one. Written additively it would be DVIIII, 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