313210981 has 2 divisors, whose sum is σ = 313210982. Its totient is φ = 313210980.

The previous prime is 313210979. The next prime is 313211053. The reversal of 313210981 is 189012313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312228900 + 982081 = 17670^2 + 991^2 .

It is a cyclic number.

It is not a de Polignac number, because 313210981 - 2¹ = 313210979 is a prime.

It is a super-2 number, since 2×313210981² = 196202237237964722, which contains 22 as substring.

Together with 313210979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313210901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156605490 + 156605491.

It is an arithmetic number, because the mean of its divisors is an integer number (156605491).

Almost surely, 2^313210981 is an apocalyptic number.

It is an amenable number.

313210981 is a deficient number, since it is larger than the sum of its proper divisors (1).

313210981 is an equidigital number, since it uses as much as digits as its factorization.

313210981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 313210981 is about 17697.7676840894. The cubic root of 313210981 is about 679.1186541759.

The spelling of 313210981 in words is "three hundred thirteen million, two hundred ten thousand, nine hundred eighty-one".