316131993 has 6 divisors (see below), whose sum is σ = 456635114. Its totient is φ = 210754656.

The previous prime is 316131967. The next prime is 316132027. The reversal of 316131993 is 399131613.

316131993 is a `hidden beast` number, since 31 + 613 + 1 + 9 + 9 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 208138329 + 107993664 = 14427^2 + 10392^2 .

It is not a de Polignac number, because 316131993 - 2⁵ = 316131961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (316131943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17562880 + ... + 17562897.

Almost surely, 2^316131993 is an apocalyptic number.

It is an amenable number.

316131993 is a deficient number, since it is larger than the sum of its proper divisors (140503121).

316131993 is a wasteful number, since it uses less digits than its factorization.

316131993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35125783 (or 35125780 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 316131993 is about 17780.1010402078. The cubic root of 316131993 is about 681.2232832100.

The spelling of 316131993 in words is "three hundred sixteen million, one hundred thirty-one thousand, nine hundred ninety-three".