23713561 has 4 divisors (see below), whose sum is σ = 24531300. Its totient is φ = 22895824.

The previous prime is 23713553. The next prime is 23713579. The reversal of 23713561 is 16531732.

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 12823561 + 10890000 = 3581^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 23713561 - 2³ = 23713553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23713531) 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, 408826 + ... + 408883.

It is an arithmetic number, because the mean of its divisors is an integer number (6132825).

Almost surely, 2^23713561 is an apocalyptic number.

It is an amenable number.

23713561 is a deficient number, since it is larger than the sum of its proper divisors (817739).

23713561 is an equidigital number, since it uses as much as digits as its factorization.

23713561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817738.

The product of its digits is 3780, while the sum is 28.

The square root of 23713561 is about 4869.6571747917. The cubic root of 23713561 is about 287.2977723421.

The spelling of 23713561 in words is "twenty-three million, seven hundred thirteen thousand, five hundred sixty-one".