23564521 has 2 divisors, whose sum is σ = 23564522. Its totient is φ = 23564520.

The previous prime is 23564507. The next prime is 23564543. The reversal of 23564521 is 12546532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 7080921 = 4060^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 23564521 - 2⁷ = 23564393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23564521.

It is not a weakly prime, because it can be changed into another prime (23564551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11782260 + 11782261.

It is an arithmetic number, because the mean of its divisors is an integer number (11782261).

Almost surely, 2^23564521 is an apocalyptic number.

It is an amenable number.

23564521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23564521 is an equidigital number, since it uses as much as digits as its factorization.

23564521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 28.

The square root of 23564521 is about 4854.3301288643. The cubic root of 23564521 is about 286.6946170392.

The spelling of 23564521 in words is "twenty-three million, five hundred sixty-four thousand, five hundred twenty-one".