12318791 has 2 divisors, whose sum is σ = 12318792. Its totient is φ = 12318790.

The previous prime is 12318773. The next prime is 12318793. The reversal of 12318791 is 19781321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12318791 - 2¹⁸ = 12056647 is a prime.

It is a super-2 number, since 2×12318791² = 303505223403362, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12318793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12318793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6159395 + 6159396.

It is an arithmetic number, because the mean of its divisors is an integer number (6159396).

Almost surely, 2^12318791 is an apocalyptic number.

12318791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12318791 is an equidigital number, since it uses as much as digits as its factorization.

12318791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 12318791 is about 3509.8135278103. The cubic root of 12318791 is about 230.9525148673.

The spelling of 12318791 in words is "twelve million, three hundred eighteen thousand, seven hundred ninety-one".