313131361691 has 2 divisors, whose sum is σ = 313131361692. Its totient is φ = 313131361690.

The previous prime is 313131361681. The next prime is 313131361787. The reversal of 313131361691 is 196163131313.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313131361691 is a prime.

It is not a weakly prime, because it can be changed into another prime (313131361681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156565680845 + 156565680846.

It is an arithmetic number, because the mean of its divisors is an integer number (156565680846).

Almost surely, 2^313131361691 is an apocalyptic number.

313131361691 is a deficient number, since it is larger than the sum of its proper divisors (1).

313131361691 is an equidigital number, since it uses as much as digits as its factorization.

313131361691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The spelling of 313131361691 in words is "three hundred thirteen billion, one hundred thirty-one million, three hundred sixty-one thousand, six hundred ninety-one".