311404631 has 2 divisors, whose sum is σ = 311404632. Its totient is φ = 311404630.

The previous prime is 311404603. The next prime is 311404669. The reversal of 311404631 is 136404113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311404631 - 2¹⁰ = 311403607 is a prime.

It is a super-2 number, since 2×311404631² = 193945688416492322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 311404597 and 311404606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311404601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155702315 + 155702316.

It is an arithmetic number, because the mean of its divisors is an integer number (155702316).

Almost surely, 2^311404631 is an apocalyptic number.

311404631 is a deficient number, since it is larger than the sum of its proper divisors (1).

311404631 is an equidigital number, since it uses as much as digits as its factorization.

311404631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 311404631 is about 17646.6606189386. The cubic root of 311404631 is about 677.8105989053.

Adding to 311404631 its reverse (136404113), we get a palindrome (447808744).

The spelling of 311404631 in words is "three hundred eleven million, four hundred four thousand, six hundred thirty-one".