316193368721 has 2 divisors, whose sum is σ = 316193368722. Its totient is φ = 316193368720.

The previous prime is 316193368679. The next prime is 316193368723. The reversal of 316193368721 is 127863391613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314614419025 + 1578949696 = 560905^2 + 39736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316193368721 is a prime.

It is a super-2 number, since 2×316193368721² (a number of 24 digits) contains 22 as substring.

Together with 316193368723, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 316193368721.

It is not a weakly prime, because it can be changed into another prime (316193368723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158096684360 + 158096684361.

It is an arithmetic number, because the mean of its divisors is an integer number (158096684361).

Almost surely, 2^316193368721 is an apocalyptic number.

It is an amenable number.

316193368721 is a deficient number, since it is larger than the sum of its proper divisors (1).

316193368721 is an equidigital number, since it uses as much as digits as its factorization.

316193368721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The spelling of 316193368721 in words is "three hundred sixteen billion, one hundred ninety-three million, three hundred sixty-eight thousand, seven hundred twenty-one".