12831565 has 16 divisors (see below), whose sum is σ = 16084656. Its totient is φ = 9817600.

The previous prime is 12831541. The next prime is 12831607. The reversal of 12831565 is 56513821.

12831565 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 841 + 12830724 = 29^2 + 3582^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12831565 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 15 ways as a sum of consecutive naturals, for example, 10275 + ... + 11455.

It is an arithmetic number, because the mean of its divisors is an integer number (1005291).

Almost surely, 2^12831565 is an apocalyptic number.

It is an amenable number.

12831565 is a deficient number, since it is larger than the sum of its proper divisors (3253091).

12831565 is a wasteful number, since it uses less digits than its factorization.

12831565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280.

The product of its digits is 7200, while the sum is 31.

The square root of 12831565 is about 3582.1173905946. The cubic root of 12831565 is about 234.1135458391.

The spelling of 12831565 in words is "twelve million, eight hundred thirty-one thousand, five hundred sixty-five".