319719687257 has 2 divisors, whose sum is σ = 319719687258. Its totient is φ = 319719687256.

The previous prime is 319719687247. The next prime is 319719687281. The reversal of 319719687257 is 752786917913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292496007241 + 27223680016 = 540829^2 + 164996^2 .

It is an emirp because it is prime and its reverse (752786917913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 319719687257 - 2⁶ = 319719687193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 319719687193 and 319719687202.

It is not a weakly prime, because it can be changed into another prime (319719687247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159859843628 + 159859843629.

It is an arithmetic number, because the mean of its divisors is an integer number (159859843629).

Almost surely, 2^319719687257 is an apocalyptic number.

It is an amenable number.

319719687257 is a deficient number, since it is larger than the sum of its proper divisors (1).

319719687257 is an equidigital number, since it uses as much as digits as its factorization.

319719687257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40007520, while the sum is 65.

The spelling of 319719687257 in words is "three hundred nineteen billion, seven hundred nineteen million, six hundred eighty-seven thousand, two hundred fifty-seven".