311323131 has 12 divisors (see below), whose sum is σ = 513930352. Its totient is φ = 177898896.

The previous prime is 311323109. The next prime is 311323141. The reversal of 311323131 is 131323113.

It is a happy number.

311323131 is a `hidden beast` number, since 311 + 323 + 1 + 31 = 666.

It is not a de Polignac number, because 311323131 - 2⁷ = 311323003 is a prime.

It is a super-2 number, since 2×311323131² = 193844183791286322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311323141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2470756 + ... + 2470881.

Almost surely, 2^311323131 is an apocalyptic number.

311323131 is a deficient number, since it is larger than the sum of its proper divisors (202607221).

311323131 is a wasteful number, since it uses less digits than its factorization.

311323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941650 (or 4941647 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 311323131 is about 17644.3512490542. The cubic root of 311323131 is about 677.7514621443.

Subtracting from 311323131 its sum of digits (18), we obtain a palindrome (311323113).

Adding to 311323131 its reverse (131323113), we get a palindrome (442646244).

It can be divided in two parts, 3113 and 23131, that added together give a square (26244 = 162²).

The spelling of 311323131 in words is "three hundred eleven million, three hundred twenty-three thousand, one hundred thirty-one".