319395521 has 2 divisors, whose sum is σ = 319395522. Its totient is φ = 319395520.

The previous prime is 319395487. The next prime is 319395523. The reversal of 319395521 is 125593913.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281400625 + 37994896 = 16775^2 + 6164^2 .

It is a cyclic number.

It is not a de Polignac number, because 319395521 - 2²² = 315201217 is a prime.

It is a super-2 number, since 2×319395521² = 204026997669722882, which contains 22 as substring.

Together with 319395523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (319395523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159697760 + 159697761.

It is an arithmetic number, because the mean of its divisors is an integer number (159697761).

Almost surely, 2^319395521 is an apocalyptic number.

It is an amenable number.

319395521 is a deficient number, since it is larger than the sum of its proper divisors (1).

319395521 is an equidigital number, since it uses as much as digits as its factorization.

319395521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 38.

The square root of 319395521 is about 17871.6401317842. The cubic root of 319395521 is about 683.5594219688.

The spelling of 319395521 in words is "three hundred nineteen million, three hundred ninety-five thousand, five hundred twenty-one".