316693981 has 2 divisors, whose sum is σ = 316693982. Its totient is φ = 316693980.

The previous prime is 316693967. The next prime is 316694023. The reversal of 316693981 is 189396613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310957956 + 5736025 = 17634^2 + 2395^2 .

It is a cyclic number.

It is not a de Polignac number, because 316693981 - 2⁹ = 316693469 is a prime.

It is a super-2 number, since 2×316693981² = 200590155203256722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316693381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158346990 + 158346991.

It is an arithmetic number, because the mean of its divisors is an integer number (158346991).

Almost surely, 2^316693981 is an apocalyptic number.

It is an amenable number.

316693981 is a deficient number, since it is larger than the sum of its proper divisors (1).

316693981 is an equidigital number, since it uses as much as digits as its factorization.

316693981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 316693981 is about 17795.8978700149. The cubic root of 316693981 is about 681.6267145666.

The spelling of 316693981 in words is "three hundred sixteen million, six hundred ninety-three thousand, nine hundred eighty-one".