311122139 has 2 divisors, whose sum is σ = 311122140. Its totient is φ = 311122138.

The previous prime is 311122129. The next prime is 311122181. The reversal of 311122139 is 931221113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311122139 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311122129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155561069 + 155561070.

It is an arithmetic number, because the mean of its divisors is an integer number (155561070).

Almost surely, 2^311122139 is an apocalyptic number.

311122139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311122139 is an equidigital number, since it uses as much as digits as its factorization.

311122139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 311122139 is about 17638.6546822596. The cubic root of 311122139 is about 677.6055773339.

The spelling of 311122139 in words is "three hundred eleven million, one hundred twenty-two thousand, one hundred thirty-nine".