311908131 has 8 divisors (see below), whose sum is σ = 462086160. Its totient is φ = 207938736.

The previous prime is 311908109. The next prime is 311908139. The reversal of 311908131 is 131809113.

It is a happy number.

It is not a de Polignac number, because 311908131 - 2¹¹ = 311906083 is a prime.

It is a super-2 number, since 2×311908131² = 194573364367826322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 11552153 = 311908131 / (3 + 1 + 1 + 9 + 0 + 8 + 1 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 311908095 and 311908104.

It is not an unprimeable number, because it can be changed into a prime (311908139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5776050 + ... + 5776103.

It is an arithmetic number, because the mean of its divisors is an integer number (57760770).

Almost surely, 2^311908131 is an apocalyptic number.

311908131 is a deficient number, since it is larger than the sum of its proper divisors (150178029).

311908131 is a wasteful number, since it uses less digits than its factorization.

311908131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11552162 (or 11552156 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 311908131 is about 17660.9210122236. The cubic root of 311908131 is about 678.1757121525.

The spelling of 311908131 in words is "three hundred eleven million, nine hundred eight thousand, one hundred thirty-one".