319138517 has 2 divisors, whose sum is σ = 319138518. Its totient is φ = 319138516.

The previous prime is 319138483. The next prime is 319138531. The reversal of 319138517 is 715831913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209496676 + 109641841 = 14474^2 + 10471^2 .

It is a cyclic number.

It is not a de Polignac number, because 319138517 - 2¹⁰ = 319137493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (319138577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159569258 + 159569259.

It is an arithmetic number, because the mean of its divisors is an integer number (159569259).

Almost surely, 2^319138517 is an apocalyptic number.

It is an amenable number.

319138517 is a deficient number, since it is larger than the sum of its proper divisors (1).

319138517 is an equidigital number, since it uses as much as digits as its factorization.

319138517 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 319138517 is about 17864.4484101805. The cubic root of 319138517 is about 683.3760290330.

The spelling of 319138517 in words is "three hundred nineteen million, one hundred thirty-eight thousand, five hundred seventeen".