23372561 has 4 divisors (see below), whose sum is σ = 23701824. Its totient is φ = 23043300.

The previous prime is 23372519. The next prime is 23372563. The reversal of 23372561 is 16527332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23372561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23372563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164525 + ... + 164666.

It is an arithmetic number, because the mean of its divisors is an integer number (5925456).

Almost surely, 2^23372561 is an apocalyptic number.

It is an amenable number.

23372561 is a deficient number, since it is larger than the sum of its proper divisors (329263).

23372561 is an equidigital number, since it uses as much as digits as its factorization.

23372561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329262.

The product of its digits is 7560, while the sum is 29.

The square root of 23372561 is about 4834.5176594982. The cubic root of 23372561 is about 285.9140082485.

Adding to 23372561 its reverse (16527332), we get a palindrome (39899893).

The spelling of 23372561 in words is "twenty-three million, three hundred seventy-two thousand, five hundred sixty-one".