311311139 has 2 divisors, whose sum is σ = 311311140. Its totient is φ = 311311138.

The previous prime is 311311109. The next prime is 311311177. The reversal of 311311139 is 931113113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311311139 is a prime.

It is not a weakly prime, because it can be changed into another prime (311311109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155655569 + 155655570.

It is an arithmetic number, because the mean of its divisors is an integer number (155655570).

Almost surely, 2^311311139 is an apocalyptic number.

311311139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311311139 is an equidigital number, since it uses as much as digits as its factorization.

311311139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243, while the sum is 23.

The square root of 311311139 is about 17644.0114203092. The cubic root of 311311139 is about 677.7427598250.

The spelling of 311311139 in words is "three hundred eleven million, three hundred eleven thousand, one hundred thirty-nine".