23772561 has 4 divisors (see below), whose sum is σ = 31696752. Its totient is φ = 15848372.

The previous prime is 23772559. The next prime is 23772571. The reversal of 23772561 is 16527732.

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 not a de Polignac number, because 23772561 - 2¹ = 23772559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23772521) 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, 3962091 + ... + 3962096.

It is an arithmetic number, because the mean of its divisors is an integer number (7924188).

Almost surely, 2^23772561 is an apocalyptic number.

It is an amenable number.

23772561 is a deficient number, since it is larger than the sum of its proper divisors (7924191).

23772561 is an equidigital number, since it uses as much as digits as its factorization.

23772561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7924190.

The product of its digits is 17640, while the sum is 33.

The square root of 23772561 is about 4875.7113327185. The cubic root of 23772561 is about 287.5358432942.

The spelling of 23772561 in words is "twenty-three million, seven hundred seventy-two thousand, five hundred sixty-one".