311042161 has 2 divisors, whose sum is σ = 311042162. Its totient is φ = 311042160.

The previous prime is 311042153. The next prime is 311042201. The reversal of 311042161 is 161240113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252810000 + 58232161 = 15900^2 + 7631^2 .

It is a cyclic number.

It is not a de Polignac number, because 311042161 - 2³ = 311042153 is a prime.

It is not a weakly prime, because it can be changed into another prime (311042861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155521080 + 155521081.

It is an arithmetic number, because the mean of its divisors is an integer number (155521081).

Almost surely, 2^311042161 is an apocalyptic number.

It is an amenable number.

311042161 is a deficient number, since it is larger than the sum of its proper divisors (1).

311042161 is an equidigital number, since it uses as much as digits as its factorization.

311042161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 311042161 is about 17636.3874135266. The cubic root of 311042161 is about 677.5475099102.

Adding to 311042161 its reverse (161240113), we get a palindrome (472282274).

The spelling of 311042161 in words is "three hundred eleven million, forty-two thousand, one hundred sixty-one".