311616139 has 2 divisors, whose sum is σ = 311616140. Its totient is φ = 311616138.

The previous prime is 311616083. The next prime is 311616143. The reversal of 311616139 is 931616113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311616139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311616139.

It is not a weakly prime, because it can be changed into another prime (311616199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155808069 + 155808070.

It is an arithmetic number, because the mean of its divisors is an integer number (155808070).

Almost surely, 2^311616139 is an apocalyptic number.

311616139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311616139 is an equidigital number, since it uses as much as digits as its factorization.

311616139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 31.

The square root of 311616139 is about 17652.6524635818. The cubic root of 311616139 is about 677.9640219275.

The spelling of 311616139 in words is "three hundred eleven million, six hundred sixteen thousand, one hundred thirty-nine".