12515657 has 32 divisors (see below), whose sum is σ = 16809984. Its totient is φ = 9028800.

The previous prime is 12515651. The next prime is 12515663. The reversal of 12515657 is 75651521.

It is an interprime number because it is at equal distance from previous prime (12515651) and next prime (12515663).

It is not a de Polignac number, because 12515657 - 2⁸ = 12515401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12515651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65432 + ... + 65622.

It is an arithmetic number, because the mean of its divisors is an integer number (525312).

Almost surely, 2^12515657 is an apocalyptic number.

It is an amenable number.

12515657 is a deficient number, since it is larger than the sum of its proper divisors (4294327).

12515657 is a wasteful number, since it uses less digits than its factorization.

12515657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 10500, while the sum is 32.

The square root of 12515657 is about 3537.7474471760. The cubic root of 12515657 is about 232.1762990605.

The spelling of 12515657 in words is "twelve million, five hundred fifteen thousand, six hundred fifty-seven".