353
+353 is the international calling code for Ireland.
- Odd
- Prime
Where 353 fits
Why 353 is special
Ireland sits in the 3x block the ITU allocated to Europe. Northern Ireland uses +44 as part of the United Kingdom, so calls across the land border on the island of Ireland are international calls in numbering terms.
353 is part of
Factors & digit properties
- Divisors (2)
- 1, 353
- Prime factorisation
- 353
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 353
- Binary
- 101100001
- Octal
- 541
- Hexadecimal
- 161
- Roman numeral
- CCCLIII
- Scientific notation
- 3.530 × 10^2
Other mathematical patterns
- Palindromic number
- Deficient number
Related numbers & connections
Ireland uses +353 and Northern Ireland uses +44, so a call across the only land border on the island is an international one in numbering terms.
View 44 →Other connections
- contrasts with44
why?
Strength 0.50, confidence "high".
Geography
+353 reaches Ireland, in the ITU's European 3x block. Northern Ireland uses +44 as part of the United Kingdom, so a call across the only land border on the island is an international one in numbering terms.
DocumentedGeographyGeography: Ireland
Common questions
Is 353 a prime number?
Yes, 353 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 353?
The factors of 353 are 1, 353.
What is 353 in Roman numerals?
353 in Roman numerals is CCCLIII.
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