23509313 has 2 divisors, whose sum is σ = 23509314. Its totient is φ = 23509312.

The previous prime is 23509301. The next prime is 23509331. The reversal of 23509313 is 31390532.

Together with next prime (23509331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 9878449 = 3692^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 23509313 - 2²⁴ = 6732097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (23509333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11754656 + 11754657.

It is an arithmetic number, because the mean of its divisors is an integer number (11754657).

Almost surely, 2^23509313 is an apocalyptic number.

It is an amenable number.

23509313 is a deficient number, since it is larger than the sum of its proper divisors (1).

23509313 is an equidigital number, since it uses as much as digits as its factorization.

23509313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 23509313 is about 4848.6403248746. The cubic root of 23509313 is about 286.4705483605.

Adding to 23509313 its reverse (31390532), we get a palindrome (54899845).

The spelling of 23509313 in words is "twenty-three million, five hundred nine thousand, three hundred thirteen".