311930913 has 12 divisors (see below), whose sum is σ = 483811440. Its totient is φ = 178246152.

The previous prime is 311930891. The next prime is 311930929. The reversal of 311930913 is 319039113.

It is a happy number.

It is not a de Polignac number, because 311930913 - 2²² = 307736609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (311930933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1060843 + ... + 1061136.

It is an arithmetic number, because the mean of its divisors is an integer number (40317620).

Almost surely, 2^311930913 is an apocalyptic number.

It is an amenable number.

311930913 is a deficient number, since it is larger than the sum of its proper divisors (171880527).

311930913 is a wasteful number, since it uses less digits than its factorization.

311930913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121996 (or 2121989 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 311930913 is about 17661.5659837966. The cubic root of 311930913 is about 678.1922232353.

The spelling of 311930913 in words is "three hundred eleven million, nine hundred thirty thousand, nine hundred thirteen".