319679681 has 2 divisors, whose sum is σ = 319679682. Its totient is φ = 319679680.

The previous prime is 319679677. The next prime is 319679683. The reversal of 319679681 is 186976913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248850625 + 70829056 = 15775^2 + 8416^2 .

It is a cyclic number.

It is not a de Polignac number, because 319679681 - 2² = 319679677 is a prime.

It is a super-2 number, since 2×319679681² = 204390196888523522, which contains 22 as substring.

Together with 319679683, 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 (319679683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159839840 + 159839841.

It is an arithmetic number, because the mean of its divisors is an integer number (159839841).

Almost surely, 2^319679681 is an apocalyptic number.

It is an amenable number.

319679681 is a deficient number, since it is larger than the sum of its proper divisors (1).

319679681 is an equidigital number, since it uses as much as digits as its factorization.

319679681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 319679681 is about 17879.5883901168. The cubic root of 319679681 is about 683.7620784006.

The spelling of 319679681 in words is "three hundred nineteen million, six hundred seventy-nine thousand, six hundred eighty-one".