12318931 has 4 divisors (see below), whose sum is σ = 13043592. Its totient is φ = 11594272.

The previous prime is 12318923. The next prime is 12318947. The reversal of 12318931 is 13981321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12318931 - 2³ = 12318923 is a prime.

It is a super-2 number, since 2×12318931² = 303512121965522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12318931.

It is not an unprimeable number, because it can be changed into a prime (12318991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362305 + ... + 362338.

It is an arithmetic number, because the mean of its divisors is an integer number (3260898).

Almost surely, 2^12318931 is an apocalyptic number.

12318931 is a deficient number, since it is larger than the sum of its proper divisors (724661).

12318931 is an equidigital number, since it uses as much as digits as its factorization.

12318931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724660.

The product of its digits is 1296, while the sum is 28.

The square root of 12318931 is about 3509.8334718331. The cubic root of 12318931 is about 230.9533897700.

The spelling of 12318931 in words is "twelve million, three hundred eighteen thousand, nine hundred thirty-one".