311131979 has 2 divisors, whose sum is σ = 311131980. Its totient is φ = 311131978.

The previous prime is 311131969. The next prime is 311131991. The reversal of 311131979 is 979131113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311131979 - 2²⁴ = 294354763 is a prime.

It is not a weakly prime, because it can be changed into another prime (311131969) 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, 155565989 + 155565990.

It is an arithmetic number, because the mean of its divisors is an integer number (155565990).

Almost surely, 2^311131979 is an apocalyptic number.

311131979 is a deficient number, since it is larger than the sum of its proper divisors (1).

311131979 is an equidigital number, since it uses as much as digits as its factorization.

311131979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5103, while the sum is 35.

The square root of 311131979 is about 17638.9336128917. The cubic root of 311131979 is about 677.6127209042.

The spelling of 311131979 in words is "three hundred eleven million, one hundred thirty-one thousand, nine hundred seventy-nine".