319715813 has 2 divisors, whose sum is σ = 319715814. Its totient is φ = 319715812.

The previous prime is 319715791. The next prime is 319715839. The reversal of 319715813 is 318517913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316021729 + 3694084 = 17777^2 + 1922^2 .

It is a cyclic number.

It is not a de Polignac number, because 319715813 - 2²² = 315521509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319715873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159857906 + 159857907.

It is an arithmetic number, because the mean of its divisors is an integer number (159857907).

Almost surely, 2^319715813 is an apocalyptic number.

It is an amenable number.

319715813 is a deficient number, since it is larger than the sum of its proper divisors (1).

319715813 is an equidigital number, since it uses as much as digits as its factorization.

319715813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The square root of 319715813 is about 17880.5987875127. The cubic root of 319715813 is about 683.7878383119.

The spelling of 319715813 in words is "three hundred nineteen million, seven hundred fifteen thousand, eight hundred thirteen".