23131531545 has 32 divisors (see below), whose sum is σ = 37255127040. Its totient is φ = 12255437760.

The previous prime is 23131531541. The next prime is 23131531567. The reversal of 23131531545 is 54513513132.

It is not a de Polignac number, because 23131531545 - 2² = 23131531541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23131531541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2249626 + ... + 2259884.

It is an arithmetic number, because the mean of its divisors is an integer number (1164222720).

Almost surely, 2^23131531545 is an apocalyptic number.

It is an amenable number.

23131531545 is a deficient number, since it is larger than the sum of its proper divisors (14123595495).

23131531545 is a wasteful number, since it uses less digits than its factorization.

23131531545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11245.

The product of its digits is 27000, while the sum is 33.

The spelling of 23131531545 in words is "twenty-three billion, one hundred thirty-one million, five hundred thirty-one thousand, five hundred forty-five".