318516797 has 2 divisors, whose sum is σ = 318516798. Its totient is φ = 318516796.

The previous prime is 318516769. The next prime is 318516799. The reversal of 318516797 is 797615813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196392196 + 122124601 = 14014^2 + 11051^2 .

It is an emirp because it is prime and its reverse (797615813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 318516797 - 2¹⁰ = 318515773 is a prime.

It is a super-2 number, since 2×318516797² = 202905899942278418, which contains 22 as substring.

Together with 318516799, 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 (318516799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159258398 + 159258399.

It is an arithmetic number, because the mean of its divisors is an integer number (159258399).

Almost surely, 2^318516797 is an apocalyptic number.

It is an amenable number.

318516797 is a deficient number, since it is larger than the sum of its proper divisors (1).

318516797 is an equidigital number, since it uses as much as digits as its factorization.

318516797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 47.

The square root of 318516797 is about 17847.0388860449. The cubic root of 318516797 is about 682.9319744722.

The spelling of 318516797 in words is "three hundred eighteen million, five hundred sixteen thousand, seven hundred ninety-seven".