12931691 has 8 divisors (see below), whose sum is σ = 13288704. Its totient is φ = 12577320.

The previous prime is 12931669. The next prime is 12931739. The reversal of 12931691 is 19613921.

12931691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12931691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12931601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12890 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (1661088).

Almost surely, 2^12931691 is an apocalyptic number.

12931691 is a deficient number, since it is larger than the sum of its proper divisors (357013).

12931691 is an equidigital number, since it uses as much as digits as its factorization.

12931691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321.

The product of its digits is 2916, while the sum is 32.

The square root of 12931691 is about 3596.0660449997. The cubic root of 12931691 is about 234.7209060321.

The spelling of 12931691 in words is "twelve million, nine hundred thirty-one thousand, six hundred ninety-one".