12691731 has 12 divisors (see below), whose sum is σ = 18324888. Its totient is φ = 7809984.

The previous prime is 12691717. The next prime is 12691733. The reversal of 12691731 is 13719621.

It is not a de Polignac number, because 12691731 - 2⁹ = 12691219 is a prime.

It is a super-2 number, since 2×12691731² = 322160071552722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12010 + ... + 13023.

It is an arithmetic number, because the mean of its divisors is an integer number (1527074).

Almost surely, 2^12691731 is an apocalyptic number.

12691731 is a deficient number, since it is larger than the sum of its proper divisors (5633157).

12691731 is a wasteful number, since it uses less digits than its factorization.

12691731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25062 (or 25049 counting only the distinct ones).

The product of its digits is 2268, while the sum is 30.

The square root of 12691731 is about 3562.5455786558. The cubic root of 12691731 is about 233.2600080256.

The spelling of 12691731 in words is "twelve million, six hundred ninety-one thousand, seven hundred thirty-one".