12531715444 has 24 divisors (see below), whose sum is σ = 23848118280. Its totient is φ = 5737890816.

The previous prime is 12531715429. The next prime is 12531715459. The reversal of 12531715444 is 44451713521.

It is an interprime number because it is at equal distance from previous prime (12531715429) and next prime (12531715459).

It can be written as a sum of positive squares in 4 ways, for example, as 4873715344 + 7658000100 = 69812^2 + 87510^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2487889 + ... + 2492920.

It is an arithmetic number, because the mean of its divisors is an integer number (993671595).

Almost surely, 2^12531715444 is an apocalyptic number.

It is an amenable number.

12531715444 is a deficient number, since it is larger than the sum of its proper divisors (11316402836).

12531715444 is a wasteful number, since it uses less digits than its factorization.

12531715444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4980867 (or 4980865 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The spelling of 12531715444 in words is "twelve billion, five hundred thirty-one million, seven hundred fifteen thousand, four hundred forty-four".