12945631 has 12 divisors (see below), whose sum is σ = 14100600. Its totient is φ = 11851920.

The previous prime is 12945617. The next prime is 12945637. The reversal of 12945631 is 13654921.

It is not a de Polignac number, because 12945631 - 2¹⁵ = 12912863 is a prime.

It is a super-2 number, since 2×12945631² = 335178723976322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12945593 and 12945602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12945637) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 17905 + ... + 18613.

It is an arithmetic number, because the mean of its divisors is an integer number (1175050).

Almost surely, 2^12945631 is an apocalyptic number.

12945631 is a deficient number, since it is larger than the sum of its proper divisors (1154969).

12945631 is an equidigital number, since it uses as much as digits as its factorization.

12945631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 759 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 12945631 is about 3598.0037520825. The cubic root of 12945631 is about 234.8052165944.

The spelling of 12945631 in words is "twelve million, nine hundred forty-five thousand, six hundred thirty-one".