319718857 has 2 divisors, whose sum is σ = 319718858. Its totient is φ = 319718856.

The previous prime is 319718809. The next prime is 319718869. The reversal of 319718857 is 758817913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 299324601 + 20394256 = 17301^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 319718857 - 2¹¹ = 319716809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 319718857.

It is not a weakly prime, because it can be changed into another prime (319718897) 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, 159859428 + 159859429.

It is an arithmetic number, because the mean of its divisors is an integer number (159859429).

Almost surely, 2^319718857 is an apocalyptic number.

It is an amenable number.

319718857 is a deficient number, since it is larger than the sum of its proper divisors (1).

319718857 is an equidigital number, since it uses as much as digits as its factorization.

319718857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 49.

The square root of 319718857 is about 17880.6839075020. The cubic root of 319718857 is about 683.7900084095.

The spelling of 319718857 in words is "three hundred nineteen million, seven hundred eighteen thousand, eight hundred fifty-seven".