311345631 has 12 divisors (see below), whose sum is σ = 450690552. Its totient is φ = 207116496.

The previous prime is 311345627. The next prime is 311345681. The reversal of 311345631 is 136543113.

311345631 is a `hidden beast` number, since 311 + 345 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 311345631 - 2² = 311345627 is a prime.

It is a super-2 number, since 2×311345631² = 193872203885576322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311345595 and 311345604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311345611) 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, 32836 + ... + 41241.

It is an arithmetic number, because the mean of its divisors is an integer number (37557546).

Almost surely, 2^311345631 is an apocalyptic number.

311345631 is a deficient number, since it is larger than the sum of its proper divisors (139344921).

311345631 is a wasteful number, since it uses less digits than its factorization.

311345631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74550 (or 74547 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 311345631 is about 17644.9888353606. The cubic root of 311345631 is about 677.7677892752.

Adding to 311345631 its reverse (136543113), we get a palindrome (447888744).

The spelling of 311345631 in words is "three hundred eleven million, three hundred forty-five thousand, six hundred thirty-one".