311323431 has 32 divisors (see below), whose sum is σ = 451396800. Its totient is φ = 190121984.

The previous prime is 311323429. The next prime is 311323447. The reversal of 311323431 is 134323113.

It is a cyclic number.

It is not a de Polignac number, because 311323431 - 2¹ = 311323429 is a prime.

It is a super-2 number, since 2×311323431² = 193844557379223522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311323398 and 311323407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311323451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 402361 + ... + 403133.

It is an arithmetic number, because the mean of its divisors is an integer number (14106150).

Almost surely, 2^311323431 is an apocalyptic number.

311323431 is a deficient number, since it is larger than the sum of its proper divisors (140073369).

311323431 is a wasteful number, since it uses less digits than its factorization.

311323431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995.

The product of its digits is 648, while the sum is 21.

The square root of 311323431 is about 17644.3597503565. The cubic root of 311323431 is about 677.7516798445.

Adding to 311323431 its reverse (134323113), we get a palindrome (445646544).

The spelling of 311323431 in words is "three hundred eleven million, three hundred twenty-three thousand, four hundred thirty-one".