12918331 has 4 divisors (see below), whose sum is σ = 12927600. Its totient is φ = 12909064.

The previous prime is 12918329. The next prime is 12918349. The reversal of 12918331 is 13381921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12918331 - 2¹ = 12918329 is a prime.

It is a super-2 number, since 2×12918331² = 333766551651122, 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 12918331.

It is not an unprimeable number, because it can be changed into a prime (12918371) 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 3 ways as a sum of consecutive naturals, for example, 2071 + ... + 5488.

It is an arithmetic number, because the mean of its divisors is an integer number (3231900).

Almost surely, 2^12918331 is an apocalyptic number.

12918331 is a deficient number, since it is larger than the sum of its proper divisors (9269).

12918331 is an equidigital number, since it uses as much as digits as its factorization.

12918331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9268.

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

The square root of 12918331 is about 3594.2079795137. The cubic root of 12918331 is about 234.6400464900.

The spelling of 12918331 in words is "twelve million, nine hundred eighteen thousand, three hundred thirty-one".