12931643 has 2 divisors, whose sum is σ = 12931644. Its totient is φ = 12931642.

The previous prime is 12931631. The next prime is 12931661. The reversal of 12931643 is 34613921.

12931643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12931643 is a prime.

It is not a weakly prime, because it can be changed into another prime (12931043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6465821 + 6465822.

It is an arithmetic number, because the mean of its divisors is an integer number (6465822).

Almost surely, 2^12931643 is an apocalyptic number.

12931643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12931643 is an equidigital number, since it uses as much as digits as its factorization.

12931643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 12931643 is about 3596.0593710338. The cubic root of 12931643 is about 234.7206156184.

The spelling of 12931643 in words is "twelve million, nine hundred thirty-one thousand, six hundred forty-three".