12531813 has 16 divisors (see below), whose sum is σ = 19268736. Its totient is φ = 7096320.

The previous prime is 12531809. The next prime is 12531829. The reversal of 12531813 is 31813521.

It is not a de Polignac number, because 12531813 - 2² = 12531809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531833) 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, 268 + ... + 5013.

It is an arithmetic number, because the mean of its divisors is an integer number (1204296).

Almost surely, 2^12531813 is an apocalyptic number.

It is an amenable number.

12531813 is a deficient number, since it is larger than the sum of its proper divisors (6736923).

12531813 is a wasteful number, since it uses less digits than its factorization.

12531813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5404.

The product of its digits is 720, while the sum is 24.

The square root of 12531813 is about 3540.0300846179. The cubic root of 12531813 is about 232.2761587114.

The spelling of 12531813 in words is "twelve million, five hundred thirty-one thousand, eight hundred thirteen".