111291161 has 2 divisors, whose sum is σ = 111291162. Its totient is φ = 111291160.

The previous prime is 111291143. The next prime is 111291199. The reversal of 111291161 is 161192111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89491600 + 21799561 = 9460^2 + 4669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111291161 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (111299161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55645580 + 55645581.

It is an arithmetic number, because the mean of its divisors is an integer number (55645581).

Almost surely, 2^111291161 is an apocalyptic number.

It is an amenable number.

111291161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111291161 is an equidigital number, since it uses as much as digits as its factorization.

111291161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 23.

The square root of 111291161 is about 10549.4625929476. The cubic root of 111291161 is about 481.0093935058.

The spelling of 111291161 in words is "one hundred eleven million, two hundred ninety-one thousand, one hundred sixty-one".