MathQuarryCalculators

Primes / Is 261 prime?

Is 261 a Prime Number?

No261 = 3^2 x 29

261 is NOT prime: 3 × 87 = 261. That makes 3 a genuine divisor of 261 beyond 1 and 261 itself. Fully broken down, 261 = 3^2 × 29, for 6 divisors total. 261 sits between primes 257 and 263, 4 below and 2 above. 261: 3, 9 divide 261 evenly, checked against 2-12. 261 is odd, digit sum 9 for 261, digital root 9 for 261. 261 has 5 primes within 10 of 261.

Factors
1, 3, 9, 29, 87, 261
Number of factors
6
Prime?
No
Prime factorization
3^2 x 29
Even or odd
Odd
Square
68121
Cube
17779581
Binary
100000101
Hexadecimal
105
Roman numeral
CCLXI
Perfect square?
No
Perfect cube?
No
Perfect number?
No
Triangular number?
No
Fibonacci number?
No
Full facts for 261 →Factors of 261 →