313156878191 has 4 divisors (see below), whose sum is σ = 315928178112. Its totient is φ = 310385578272.

The previous prime is 313156878169. The next prime is 313156878233. The reversal of 313156878191 is 191878651313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313156878191 is a prime.

It is a super-2 number, since 2×313156878191² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313156878101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385649791 + ... + 1385650016.

It is an arithmetic number, because the mean of its divisors is an integer number (78982044528).

Almost surely, 2^313156878191 is an apocalyptic number.

313156878191 is a deficient number, since it is larger than the sum of its proper divisors (2771299921).

313156878191 is a wasteful number, since it uses less digits than its factorization.

313156878191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771299920.

The product of its digits is 1088640, while the sum is 53.

The spelling of 313156878191 in words is "three hundred thirteen billion, one hundred fifty-six million, eight hundred seventy-eight thousand, one hundred ninety-one".