23975561 has 4 divisors (see below), whose sum is σ = 23991300. Its totient is φ = 23959824.

The previous prime is 23975543. The next prime is 23975569. The reversal of 23975561 is 16557932.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2119936 + 21855625 = 1456^2 + 4675^2 .

It is a cyclic number.

It is not a de Polignac number, because 23975561 - 2¹⁰ = 23974537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23975569) 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, 5306 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (5997825).

Almost surely, 2^23975561 is an apocalyptic number.

It is an amenable number.

23975561 is a deficient number, since it is larger than the sum of its proper divisors (15739).

23975561 is a wasteful number, since it uses less digits than its factorization.

23975561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15738.

The product of its digits is 56700, while the sum is 38.

The square root of 23975561 is about 4896.4845552702. The cubic root of 23975561 is about 288.3519720949.

The spelling of 23975561 in words is "twenty-three million, nine hundred seventy-five thousand, five hundred sixty-one".