23712561 has 16 divisors (see below), whose sum is σ = 35577600. Its totient is φ = 15606864.

The previous prime is 23712553. The next prime is 23712607. The reversal of 23712561 is 16521732.

It is a happy number.

It is not a de Polignac number, because 23712561 - 2³ = 23712553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23712511) 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 in 15 ways as a sum of consecutive naturals, for example, 3426 + ... + 7691.

It is an arithmetic number, because the mean of its divisors is an integer number (2223600).

Almost surely, 2^23712561 is an apocalyptic number.

It is an amenable number.

23712561 is a deficient number, since it is larger than the sum of its proper divisors (11865039).

23712561 is a wasteful number, since it uses less digits than its factorization.

23712561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11205 (or 11199 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 23712561 is about 4869.5544970767. The cubic root of 23712561 is about 287.2937338398.

The spelling of 23712561 in words is "twenty-three million, seven hundred twelve thousand, five hundred sixty-one".