12931565 has 4 divisors (see below), whose sum is σ = 15517884. Its totient is φ = 10345248.

The previous prime is 12931553. The next prime is 12931591. The reversal of 12931565 is 56513921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56513921 = 23 ⋅2457127.

It can be written as a sum of positive squares in 2 ways, for example, as 2601769 + 10329796 = 1613^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 12931565 - 2⁴ = 12931549 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1293152 + ... + 1293161.

It is an arithmetic number, because the mean of its divisors is an integer number (3879471).

Almost surely, 2^12931565 is an apocalyptic number.

It is an amenable number.

12931565 is a deficient number, since it is larger than the sum of its proper divisors (2586319).

12931565 is an equidigital number, since it uses as much as digits as its factorization.

12931565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2586318.

The product of its digits is 8100, while the sum is 32.

The square root of 12931565 is about 3596.0485258127. The cubic root of 12931565 is about 234.7201436948.

The spelling of 12931565 in words is "twelve million, nine hundred thirty-one thousand, five hundred sixty-five".