311244391 has 2 divisors, whose sum is σ = 311244392. Its totient is φ = 311244390.

The previous prime is 311244389. The next prime is 311244421. The reversal of 311244391 is 193442113.

It is a weak prime.

It is an emirp because it is prime and its reverse (193442113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311244391 - 2¹ = 311244389 is a prime.

Together with 311244389, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311244331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155622195 + 155622196.

It is an arithmetic number, because the mean of its divisors is an integer number (155622196).

Almost surely, 2^311244391 is an apocalyptic number.

311244391 is a deficient number, since it is larger than the sum of its proper divisors (1).

311244391 is an equidigital number, since it uses as much as digits as its factorization.

311244391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 311244391 is about 17642.1197989357. The cubic root of 311244391 is about 677.6943182483.

The spelling of 311244391 in words is "three hundred eleven million, two hundred forty-four thousand, three hundred ninety-one".