311291 has 2 divisors, whose sum is σ = 311292. Its totient is φ = 311290.

The previous prime is 311279. The next prime is 311293. The reversal of 311291 is 192113.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (192113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311291 is a prime.

Together with 311293, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 311291.

It is not a weakly prime, because it can be changed into another prime (311293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155645 + 155646.

It is an arithmetic number, because the mean of its divisors is an integer number (155646).

2³¹¹²⁹¹ is an apocalyptic number.

311291 is a deficient number, since it is larger than the sum of its proper divisors (1).

311291 is an equidigital number, since it uses as much as digits as its factorization.

311291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 17.

The square root of 311291 is about 557.9345839792. The cubic root of 311291 is about 67.7728144912.

The spelling of 311291 in words is "three hundred eleven thousand, two hundred ninety-one".