169
169 is the copyright sign.
Where 169 fits
Why 169 is special
The Berne Convention removed the requirement to mark a work at all, so the symbol is now a convention rather than a condition of protection.
169 is part of
Factors & digit properties
- Divisors (3)
- 1, 13, 169
- Prime factorisation
- 13^2
- Digit sum
- 16
- Digital root
- 7
Representations
- Decimal
- 169
- Binary
- 10101001
- Octal
- 251
- Hexadecimal
- a9
- Roman numeral
- CLXIX
- Scientific notation
- 1.690 × 10^2
Other mathematical patterns
- Deficient number
- Powerful number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
Both are legal notices reduced to single characters, and neither creates the right it refers to.
View 174 →Copyright arises on creation and registration is required for the registered mark, which is why only one notice is optional.
View 174 →Technology & computing
U+00A9 COPYRIGHT SIGN indicates a claim of copyright. Under the Berne Convention protection arises on creation without formality, so the notice is informative rather than constitutive in signatory states.
DocumentedTechnology & computingGeography: International — Unicode ConsortiumPeriod: 1991–
Common questions
Is 169 a prime number?
No, 169 is not prime.
What are the factors of 169?
The factors of 169 are 1, 13, 169.
What is 169 in Roman numerals?
169 in Roman numerals is CLXIX.
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