23613561 has 24 divisors (see below), whose sum is σ = 38020320. Its totient is φ = 14034816.

The previous prime is 23613553. The next prime is 23613563. The reversal of 23613561 is 16531632.

It is not a de Polignac number, because 23613561 - 2³ = 23613553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23613563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1155 + ... + 6968.

It is an arithmetic number, because the mean of its divisors is an integer number (1584180).

Almost surely, 2^23613561 is an apocalyptic number.

It is an amenable number.

23613561 is a deficient number, since it is larger than the sum of its proper divisors (14406759).

23613561 is a wasteful number, since it uses less digits than its factorization.

23613561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165 (or 8162 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 23613561 is about 4859.3786639858. The cubic root of 23613561 is about 286.8933587864.

It can be divided in two parts, 236135 and 61, that added together give a square (236196 = 486²).

The spelling of 23613561 in words is "twenty-three million, six hundred thirteen thousand, five hundred sixty-one".