12531816 has 48 divisors (see below), whose sum is σ = 37028160. Its totient is φ = 3797280.

The previous prime is 12531809. The next prime is 12531829. The reversal of 12531816 is 61813521.

It is a self number, because there is not a number n which added to its sum of digits gives 12531816.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7120 + ... + 8703.

It is an arithmetic number, because the mean of its divisors is an integer number (771420).

Almost surely, 2^12531816 is an apocalyptic number.

It is an amenable number.

12531816 is an abundant number, since it is smaller than the sum of its proper divisors (24496344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12531816 is a wasteful number, since it uses less digits than its factorization.

12531816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15846 (or 15839 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 12531816 is about 3540.0305083431. The cubic root of 12531816 is about 232.2761772463.

The spelling of 12531816 in words is "twelve million, five hundred thirty-one thousand, eight hundred sixteen".