23513631531 has 16 divisors (see below), whose sum is σ = 33784907520. Its totient is φ = 14460608160.

The previous prime is 23513631511. The next prime is 23513631571. The reversal of 23513631531 is 13513631532.

It is a happy number.

It is not a de Polignac number, because 23513631531 - 2⁵ = 23513631499 is a prime.

It is a super-2 number, since 2×23513631531² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23513631492 and 23513631501.

It is not an unprimeable number, because it can be changed into a prime (23513631511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132565 + ... + 254166.

It is an arithmetic number, because the mean of its divisors is an integer number (2111556720).

Almost surely, 2^23513631531 is an apocalyptic number.

23513631531 is a deficient number, since it is larger than the sum of its proper divisors (10271275989).

23513631531 is a wasteful number, since it uses less digits than its factorization.

23513631531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388306.

The product of its digits is 24300, while the sum is 33.

Subtracting from 23513631531 its reverse (13513631532), we obtain a palindrome (9999999999).

The spelling of 23513631531 in words is "twenty-three billion, five hundred thirteen million, six hundred thirty-one thousand, five hundred thirty-one".