311382139 has 2 divisors, whose sum is σ = 311382140. Its totient is φ = 311382138.

The previous prime is 311382133. The next prime is 311382151. The reversal of 311382139 is 931283113.

It is a weak prime.

It is an emirp because it is prime and its reverse (931283113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311382139 - 2³ = 311382131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311382139.

It is not a weakly prime, because it can be changed into another prime (311382131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155691069 + 155691070.

It is an arithmetic number, because the mean of its divisors is an integer number (155691070).

Almost surely, 2^311382139 is an apocalyptic number.

311382139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311382139 is an equidigital number, since it uses as much as digits as its factorization.

311382139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 311382139 is about 17646.0233197171. The cubic root of 311382139 is about 677.7942796414.

The spelling of 311382139 in words is "three hundred eleven million, three hundred eighty-two thousand, one hundred thirty-nine".