357
+357 is the international calling code for Cyprus.
- Odd
- Composite
Where 357 fits
Why 357 is special
The island is divided, and the northern area uses Turkish numbering ranges rather than +357. A telephone code is a practical marker of which administration a place is served by, independent of the formal dispute.
Factors & digit properties
- Divisors (8)
- 1, 3, 7, 17, 21, 51, 119, 357
- Prime factorisation
- 3 × 7 × 17
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 357
- Scientific notation
- 3.570 × 10^2
Roman numerals
C C C L V I I
Binary
1 0 1 1 0 0 1 0 1
1 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 357
Octal
5 4 5
5 × 64 + 4 × 8 + 5 × 1 = 357
Hexadecimal
1 6 5
1 × 256 + 6 × 16 + 5 × 1 = 357
Read as powers of two: 256 + 64 + 32 + 4 + 1 = 357.
In historical numeral systems
Egyptian
3 coils of rope, 5 hobbles, 7 strokes
3 × 100 + 5 × 10 + 7 × 1 = 357. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
5 vertical wedges (sixties place), 5 corner wedges + 7 vertical wedges (units place)
5 × 60 + 57 = 357. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
tau, then nu, then zeta, marked as a numeral
tau-nu-zeta + keraia
tau + nu + zeta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
shin, then nun, then zayin
shin-nun-zayin
shin (300) + nun (50) + zayin (7) = 357, written in descending order.
Maya
3 bars + 2 dots (upper, twenties place) over 3 bars + 2 dots (lower, units place)
17 × 20 + 17 = 357. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Lucky number (mathematical sieve)
Related numbers & connections
Malta and Cyprus are the two smallest EU member states and both are Mediterranean islands. Cyprus is divided, and its northern area uses Turkish numbering rather than +357.
View 356 →Other connections
- is associated with356
why?
Strength 0.50, confidence "high".
Geography
+357 reaches the Republic of Cyprus. Northern Cyprus is reached through Turkish numbering instead, which makes the numbering plan an accurate map of administrative control rather than of recognised sovereignty.
DocumentedGeographyGeography: Cyprus
Common questions
Is 357 a prime number?
No, 357 is not prime.
What are the factors of 357?
The factors of 357 are 1, 3, 7, 17, 21, 51, 119, 357.
What is 357 in Roman numerals?
357 in Roman numerals is CCCLVII.
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