311321131 has 16 divisors (see below), whose sum is σ = 345235968. Its totient is φ = 278373600.

The previous prime is 311321089. The next prime is 311321147. The reversal of 311321131 is 131123113.

It is a cyclic number.

It is not a de Polignac number, because 311321131 - 2⁹ = 311320619 is a prime.

It is a super-2 number, since 2×311321131² = 193841693214238322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (311321431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252286 + ... + 253516.

It is an arithmetic number, because the mean of its divisors is an integer number (21577248).

Almost surely, 2^311321131 is an apocalyptic number.

311321131 is a deficient number, since it is larger than the sum of its proper divisors (33914837).

311321131 is a wasteful number, since it uses less digits than its factorization.

311321131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602.

The product of its digits is 54, while the sum is 16.

The square root of 311321131 is about 17644.2945736008. The cubic root of 311321131 is about 677.7500108057.

Adding to 311321131 its reverse (131123113), we get a palindrome (442444244).

The spelling of 311321131 in words is "three hundred eleven million, three hundred twenty-one thousand, one hundred thirty-one".