311111161 has 2 divisors, whose sum is σ = 311111162. Its totient is φ = 311111160.

The previous prime is 311111131. The next prime is 311111183. The reversal of 311111161 is 161111113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293471161 + 17640000 = 17131^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 311111161 - 2¹³ = 311102969 is a prime.

It is not a weakly prime, because it can be changed into another prime (311111131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155555580 + 155555581.

It is an arithmetic number, because the mean of its divisors is an integer number (155555581).

Almost surely, 2^311111161 is an apocalyptic number.

It is an amenable number.

311111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

311111161 is an equidigital number, since it uses as much as digits as its factorization.

311111161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 16.

The square root of 311111161 is about 17638.3434879810. The cubic root of 311111161 is about 677.5976074291.

Adding to 311111161 its reverse (161111113), we get a palindrome (472222274).

The spelling of 311111161 in words is "three hundred eleven million, one hundred eleven thousand, one hundred sixty-one".