316501043921 has 2 divisors, whose sum is σ = 316501043922. Its totient is φ = 316501043920.

The previous prime is 316501043843. The next prime is 316501043933. The reversal of 316501043921 is 129340105613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291990010321 + 24511033600 = 540361^2 + 156560^2 .

It is an emirp because it is prime and its reverse (129340105613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316501043921 is a prime.

It is not a weakly prime, because it can be changed into another prime (316501043981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158250521960 + 158250521961.

It is an arithmetic number, because the mean of its divisors is an integer number (158250521961).

Almost surely, 2^316501043921 is an apocalyptic number.

It is an amenable number.

316501043921 is a deficient number, since it is larger than the sum of its proper divisors (1).

316501043921 is an equidigital number, since it uses as much as digits as its factorization.

316501043921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 316501043921 in words is "three hundred sixteen billion, five hundred one million, forty-three thousand, nine hundred twenty-one".