69
69 is the atomic number of thulium, factoring as 3 × 23.
- Odd
- Composite
Where 69 fits
Why 69 is special
69 is a quiet, ordinary composite number whose only mild curiosity is that reversing its digits (96) gives another multiple of 3.
Factors & digit properties
- Divisors (4)
- 1, 3, 23, 69
- Prime factorisation
- 3 × 23
- Digit sum
- 15
- Digital root
- 6
Representations
- Decimal
- 69
- Binary
- 1000101
- Octal
- 105
- Hexadecimal
- 45
- Roman numeral
- LXIX
- Scientific notation
- 6.900 × 10^1
Other mathematical patterns
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
Mathematical relationship23 is a factor of 69 (23 × 3 = 69).
69 has factor 2323 is a factor of 69 (23 × 3 = 69).
23 is a factor of 69 (23 × 3 = 69).
View 23 →Mathematically related
- has factor23
why?
Strength 0.50, confidence "high".
Science
69 is the atomic number of thulium.
DocumentedScience
Mathematics
69 factors as 3 × 23; reversing its digits gives 96, itself 3 × 32.
DocumentedMathematics
Common questions
Is 69 a prime number?
No, 69 is not prime.
What are the factors of 69?
The factors of 69 are 1, 3, 23, 69.
What is 69 in Roman numerals?
69 in Roman numerals is LXIX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026