311116891 has 2 divisors, whose sum is σ = 311116892. Its totient is φ = 311116890.

The previous prime is 311116877. The next prime is 311116913. The reversal of 311116891 is 198611113.

It is a weak prime.

It is an emirp because it is prime and its reverse (198611113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311116891 - 2⁷ = 311116763 is a prime.

It is not a weakly prime, because it can be changed into another prime (311116591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155558445 + 155558446.

It is an arithmetic number, because the mean of its divisors is an integer number (155558446).

Almost surely, 2^311116891 is an apocalyptic number.

311116891 is a deficient number, since it is larger than the sum of its proper divisors (1).

311116891 is an equidigital number, since it uses as much as digits as its factorization.

311116891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 31.

The square root of 311116891 is about 17638.5059174523. The cubic root of 311116891 is about 677.6017673682.

It can be divided in two parts, 3111 and 16891, that added together give a palindrome (20002).

The spelling of 311116891 in words is "three hundred eleven million, one hundred sixteen thousand, eight hundred ninety-one".