245
+245 is the international calling code for Guinea-Bissau.
- Odd
- Composite
Where 245 fits
Why 245 is special
Guinea-Bissau is one of three West African countries with Guinea in the name, distinguished by capital, former coloniser and calling code.
Factors & digit properties
- Divisors (6)
- 1, 5, 7, 35, 49, 245
- Prime factorisation
- 5 × 7^2
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 245
- Binary
- 11110101
- Octal
- 365
- Hexadecimal
- f5
- Roman numeral
- CCXLV
- Scientific notation
- 2.450 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
Guinea and Guinea-Bissau are two of the three West African states carrying Guinea in the name, distinguished in practice by their codes and former colonisers.
View 224 →Nearby in a sequence
- is adjacent to224
why?
Strength 0.50, confidence "high".
Geography
+245 reaches Guinea-Bissau. Guinea, Guinea-Bissau and Equatorial Guinea are separate countries with separate codes, and the shared name causes routine confusion in shipping and correspondence.
DocumentedGeographyGeography: Guinea-Bissau
Common questions
Is 245 a prime number?
No, 245 is not prime.
What are the factors of 245?
The factors of 245 are 1, 5, 7, 35, 49, 245.
What is 245 in Roman numerals?
245 in Roman numerals is CCXLV.
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: 3 August 2026