319318381 has 2 divisors, whose sum is σ = 319318382. Its totient is φ = 319318380.

The previous prime is 319318379. The next prime is 319318393. The reversal of 319318381 is 183813913.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305375625 + 13942756 = 17475^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 319318381 - 2¹ = 319318379 is a prime.

It is a super-2 number, since 2×319318381² = 203928456888922322, which contains 22 as substring.

Together with 319318379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 319318381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319318081) 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 as a sum of consecutive naturals, namely, 159659190 + 159659191.

It is an arithmetic number, because the mean of its divisors is an integer number (159659191).

Almost surely, 2^319318381 is an apocalyptic number.

It is an amenable number.

319318381 is a deficient number, since it is larger than the sum of its proper divisors (1).

319318381 is an equidigital number, since it uses as much as digits as its factorization.

319318381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 319318381 is about 17869.4818335619. The cubic root of 319318381 is about 683.5043867371.

The spelling of 319318381 in words is "three hundred nineteen million, three hundred eighteen thousand, three hundred eighty-one".