23132531 has 4 divisors (see below), whose sum is σ = 23146200. Its totient is φ = 23118864.

The previous prime is 23132521. The next prime is 23132561. The reversal of 23132531 is 13523132.

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

It is a cyclic number.

It is not a de Polignac number, because 23132531 - 2¹⁸ = 22870387 is a prime.

It is a super-2 number, since 2×23132531² = 1070227980931922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23132521) 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, 3866 + ... + 7823.

It is an arithmetic number, because the mean of its divisors is an integer number (5786550).

Almost surely, 2^23132531 is an apocalyptic number.

23132531 is a deficient number, since it is larger than the sum of its proper divisors (13669).

23132531 is a wasteful number, since it uses less digits than its factorization.

23132531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13668.

The product of its digits is 540, while the sum is 20.

The square root of 23132531 is about 4809.6289877703. The cubic root of 23132531 is about 284.9318848195.

Adding to 23132531 its reverse (13523132), we get a palindrome (36655663).

The spelling of 23132531 in words is "twenty-three million, one hundred thirty-two thousand, five hundred thirty-one".