311427139 has 2 divisors, whose sum is σ = 311427140. Its totient is φ = 311427138.

The previous prime is 311427091. The next prime is 311427169. The reversal of 311427139 is 931724113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311427139 - 2⁹ = 311426627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311427139.

It is not a weakly prime, because it can be changed into another prime (311427169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155713569 + 155713570.

It is an arithmetic number, because the mean of its divisors is an integer number (155713570).

Almost surely, 2^311427139 is an apocalyptic number.

311427139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311427139 is an equidigital number, since it uses as much as digits as its factorization.

311427139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 311427139 is about 17647.2983484725. The cubic root of 311427139 is about 677.8269289915.

The spelling of 311427139 in words is "three hundred eleven million, four hundred twenty-seven thousand, one hundred thirty-nine".