23531631 has 16 divisors (see below), whose sum is σ = 32277504. Its totient is φ = 15241824.

The previous prime is 23531617. The next prime is 23531647. The reversal of 23531631 is 13613532.

It is a happy number.

It is not a de Polignac number, because 23531631 - 2¹³ = 23523439 is a prime.

It is a super-2 number, since 2×23531631² = 1107475315040322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23531611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21606 + ... + 22668.

It is an arithmetic number, because the mean of its divisors is an integer number (2017344).

Almost surely, 2^23531631 is an apocalyptic number.

23531631 is a deficient number, since it is larger than the sum of its proper divisors (8745873).

23531631 is a wasteful number, since it uses less digits than its factorization.

23531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270.

The product of its digits is 1620, while the sum is 24.

The square root of 23531631 is about 4850.9412488712. The cubic root of 23531631 is about 286.5611709946.

The spelling of 23531631 in words is "twenty-three million, five hundred thirty-one thousand, six hundred thirty-one".