311241391 has 2 divisors, whose sum is σ = 311241392. Its totient is φ = 311241390.

The previous prime is 311241377. The next prime is 311241421. The reversal of 311241391 is 193142113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311241391 - 2⁷ = 311241263 is a prime.

It is a super-3 number, since 3×311241391³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311241361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155620695 + 155620696.

It is an arithmetic number, because the mean of its divisors is an integer number (155620696).

Almost surely, 2^311241391 is an apocalyptic number.

311241391 is a deficient number, since it is larger than the sum of its proper divisors (1).

311241391 is an equidigital number, since it uses as much as digits as its factorization.

311241391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 311241391 is about 17642.0347749346. The cubic root of 311241391 is about 677.6921408709.

The spelling of 311241391 in words is "three hundred eleven million, two hundred forty-one thousand, three hundred ninety-one".