311355431 has 2 divisors, whose sum is σ = 311355432. Its totient is φ = 311355430.

The previous prime is 311355419. The next prime is 311355433. The reversal of 311355431 is 134553113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311355431 - 2²⁶ = 244246567 is a prime.

It is a super-2 number, since 2×311355431² = 193884408826391522, which contains 22 as substring.

Together with 311355433, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311355431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311355433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155677715 + 155677716.

It is an arithmetic number, because the mean of its divisors is an integer number (155677716).

Almost surely, 2^311355431 is an apocalyptic number.

311355431 is a deficient number, since it is larger than the sum of its proper divisors (1).

311355431 is an equidigital number, since it uses as much as digits as its factorization.

311355431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 311355431 is about 17645.2665324160. The cubic root of 311355431 is about 677.7749004019.

The spelling of 311355431 in words is "three hundred eleven million, three hundred fifty-five thousand, four hundred thirty-one".