311330161 has 2 divisors, whose sum is σ = 311330162. Its totient is φ = 311330160.

The previous prime is 311330119. The next prime is 311330189. The reversal of 311330161 is 161033113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165379600 + 145950561 = 12860^2 + 12081^2 .

It is a cyclic number.

It is not a de Polignac number, because 311330161 - 2¹⁷ = 311199089 is a prime.

It is not a weakly prime, because it can be changed into another prime (311333161) 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, 155665080 + 155665081.

It is an arithmetic number, because the mean of its divisors is an integer number (155665081).

Almost surely, 2^311330161 is an apocalyptic number.

It is an amenable number.

311330161 is a deficient number, since it is larger than the sum of its proper divisors (1).

311330161 is an equidigital number, since it uses as much as digits as its factorization.

311330161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 311330161 is about 17644.5504618282. The cubic root of 311330161 is about 677.7565635501.

Adding to 311330161 its reverse (161033113), we get a palindrome (472363274).

The spelling of 311330161 in words is "three hundred eleven million, three hundred thirty thousand, one hundred sixty-one".