311490239 has 2 divisors, whose sum is σ = 311490240. Its totient is φ = 311490238.

The previous prime is 311490211. The next prime is 311490253. The reversal of 311490239 is 932094113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311490239 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311490209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155745119 + 155745120.

It is an arithmetic number, because the mean of its divisors is an integer number (155745120).

Almost surely, 2^311490239 is an apocalyptic number.

311490239 is a deficient number, since it is larger than the sum of its proper divisors (1).

311490239 is an equidigital number, since it uses as much as digits as its factorization.

311490239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 311490239 is about 17649.0860669894. The cubic root of 311490239 is about 677.8727053391.

The spelling of 311490239 in words is "three hundred eleven million, four hundred ninety thousand, two hundred thirty-nine".