316721511131 has 2 divisors, whose sum is σ = 316721511132. Its totient is φ = 316721511130.

The previous prime is 316721511083. The next prime is 316721511221. The reversal of 316721511131 is 131115127613.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 316721511131 - 2²² = 316717316827 is a prime.

It is a super-2 number, since 2×316721511131² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (316721511031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158360755565 + 158360755566.

It is an arithmetic number, because the mean of its divisors is an integer number (158360755566).

Almost surely, 2^316721511131 is an apocalyptic number.

316721511131 is a deficient number, since it is larger than the sum of its proper divisors (1).

316721511131 is an equidigital number, since it uses as much as digits as its factorization.

316721511131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

Adding to 316721511131 its reverse (131115127613), we get a palindrome (447836638744).

The spelling of 316721511131 in words is "three hundred sixteen billion, seven hundred twenty-one million, five hundred eleven thousand, one hundred thirty-one".