23315609 has 2 divisors, whose sum is σ = 23315610. Its totient is φ = 23315608.

The previous prime is 23315569. The next prime is 23315639. The reversal of 23315609 is 90651332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14992384 + 8323225 = 3872^2 + 2885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23315609 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 (23315639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11657804 + 11657805.

It is an arithmetic number, because the mean of its divisors is an integer number (11657805).

Almost surely, 2^23315609 is an apocalyptic number.

It is an amenable number.

23315609 is a deficient number, since it is larger than the sum of its proper divisors (1).

23315609 is an equidigital number, since it uses as much as digits as its factorization.

23315609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 23315609 is about 4828.6239240595. The cubic root of 23315609 is about 285.6815901515.

The spelling of 23315609 in words is "twenty-three million, three hundred fifteen thousand, six hundred nine".