23309309 has 2 divisors, whose sum is σ = 23309310. Its totient is φ = 23309308.

The previous prime is 23309291. The next prime is 23309339. The reversal of 23309309 is 90390332.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16564900 + 6744409 = 4070^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 23309309 - 2²⁴ = 6532093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23309339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11654654 + 11654655.

It is an arithmetic number, because the mean of its divisors is an integer number (11654655).

Almost surely, 2^23309309 is an apocalyptic number.

It is an amenable number.

23309309 is a deficient number, since it is larger than the sum of its proper divisors (1).

23309309 is an equidigital number, since it uses as much as digits as its factorization.

23309309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 29.

The square root of 23309309 is about 4827.9715202143. The cubic root of 23309309 is about 285.6558569449.

The spelling of 23309309 in words is "twenty-three million, three hundred nine thousand, three hundred nine".