313718981 has 2 divisors, whose sum is σ = 313718982. Its totient is φ = 313718980.

The previous prime is 313718957. The next prime is 313718983. The reversal of 313718981 is 189817313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245392225 + 68326756 = 15665^2 + 8266^2 .

It is a cyclic number.

It is not a de Polignac number, because 313718981 - 2⁶ = 313718917 is a prime.

It is a super-2 number, since 2×313718981² = 196839198079356722, which contains 22 as substring.

Together with 313718983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313718983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156859490 + 156859491.

It is an arithmetic number, because the mean of its divisors is an integer number (156859491).

Almost surely, 2^313718981 is an apocalyptic number.

It is an amenable number.

313718981 is a deficient number, since it is larger than the sum of its proper divisors (1).

313718981 is an equidigital number, since it uses as much as digits as its factorization.

313718981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 41.

The square root of 313718981 is about 17712.1139619188. The cubic root of 313718981 is about 679.4856122858.

The spelling of 313718981 in words is "three hundred thirteen million, seven hundred eighteen thousand, nine hundred eighty-one".