311118131 has 2 divisors, whose sum is σ = 311118132. Its totient is φ = 311118130.

The previous prime is 311118121. The next prime is 311118133. The reversal of 311118131 is 131811113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311118131 is a prime.

It is a super-2 number, since 2×311118131² = 193588982873866322, which contains 22 as substring.

Together with 311118133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311118133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155559065 + 155559066.

It is an arithmetic number, because the mean of its divisors is an integer number (155559066).

Almost surely, 2^311118131 is an apocalyptic number.

311118131 is a deficient number, since it is larger than the sum of its proper divisors (1).

311118131 is an equidigital number, since it uses as much as digits as its factorization.

311118131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 20.

The square root of 311118131 is about 17638.5410677868. The cubic root of 311118131 is about 677.6026675926.

Adding to 311118131 its reverse (131811113), we get a palindrome (442929244).

The spelling of 311118131 in words is "three hundred eleven million, one hundred eighteen thousand, one hundred thirty-one".