23657521 has 2 divisors, whose sum is σ = 23657522. Its totient is φ = 23657520.

The previous prime is 23657483. The next prime is 23657539. The reversal of 23657521 is 12575632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21298225 + 2359296 = 4615^2 + 1536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23657521 is a prime.

It is not a weakly prime, because it can be changed into another prime (23657551) 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, 11828760 + 11828761.

It is an arithmetic number, because the mean of its divisors is an integer number (11828761).

Almost surely, 2^23657521 is an apocalyptic number.

It is an amenable number.

23657521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23657521 is an equidigital number, since it uses as much as digits as its factorization.

23657521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 23657521 is about 4863.8997728160. The cubic root of 23657521 is about 287.0712793450.

The spelling of 23657521 in words is "twenty-three million, six hundred fifty-seven thousand, five hundred twenty-one".