318311393 has 2 divisors, whose sum is σ = 318311394. Its totient is φ = 318311392.

The previous prime is 318311347. The next prime is 318311419. The reversal of 318311393 is 393113813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263965009 + 54346384 = 16247^2 + 7372^2 .

It is a cyclic number.

It is not a de Polignac number, because 318311393 - 2⁸ = 318311137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (318311093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159155696 + 159155697.

It is an arithmetic number, because the mean of its divisors is an integer number (159155697).

Almost surely, 2^318311393 is an apocalyptic number.

It is an amenable number.

318311393 is a deficient number, since it is larger than the sum of its proper divisors (1).

318311393 is an equidigital number, since it uses as much as digits as its factorization.

318311393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 318311393 is about 17841.2833899358. The cubic root of 318311393 is about 682.7851406420.

The spelling of 318311393 in words is "three hundred eighteen million, three hundred eleven thousand, three hundred ninety-three".