311326331 has 2 divisors, whose sum is σ = 311326332. Its totient is φ = 311326330.

The previous prime is 311326307. The next prime is 311326333. The reversal of 311326331 is 133623113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311326331 is a prime.

It is a super-2 number, since 2×311326331² = 193848168747843122, which contains 22 as substring.

Together with 311326333, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 311326297 and 311326306.

It is not a weakly prime, because it can be changed into another prime (311326333) 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 as a sum of consecutive naturals, namely, 155663165 + 155663166.

It is an arithmetic number, because the mean of its divisors is an integer number (155663166).

Almost surely, 2^311326331 is an apocalyptic number.

311326331 is a deficient number, since it is larger than the sum of its proper divisors (1).

311326331 is an equidigital number, since it uses as much as digits as its factorization.

311326331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 23.

The square root of 311326331 is about 17644.4419294009. The cubic root of 311326331 is about 677.7537842731.

Adding to 311326331 its reverse (133623113), we get a palindrome (444949444).

The spelling of 311326331 in words is "three hundred eleven million, three hundred twenty-six thousand, three hundred thirty-one".