311611117 has 2 divisors, whose sum is σ = 311611118. Its totient is φ = 311611116.

The previous prime is 311611109. The next prime is 311611169. The reversal of 311611117 is 711116113.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165225316 + 146385801 = 12854^2 + 12099^2 .

It is an emirp because it is prime and its reverse (711116113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311611117 - 2³ = 311611109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311611217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155805558 + 155805559.

It is an arithmetic number, because the mean of its divisors is an integer number (155805559).

Almost surely, 2^311611117 is an apocalyptic number.

It is an amenable number.

311611117 is a deficient number, since it is larger than the sum of its proper divisors (1).

311611117 is an equidigital number, since it uses as much as digits as its factorization.

311611117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 22.

The square root of 311611117 is about 17652.5102180965. The cubic root of 311611117 is about 677.9603798894.

The spelling of 311611117 in words is "three hundred eleven million, six hundred eleven thousand, one hundred seventeen".