111171731161 has 2 divisors, whose sum is σ = 111171731162. Its totient is φ = 111171731160.

The previous prime is 111171731129. The next prime is 111171731179. The reversal of 111171731161 is 161137171111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110928963600 + 242767561 = 333060^2 + 15581^2 .

It is a cyclic number.

It is not a de Polignac number, because 111171731161 - 2⁵ = 111171731129 is a prime.

It is not a weakly prime, because it can be changed into another prime (111171731191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55585865580 + 55585865581.

It is an arithmetic number, because the mean of its divisors is an integer number (55585865581).

Almost surely, 2^111171731161 is an apocalyptic number.

It is an amenable number.

111171731161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111171731161 is an equidigital number, since it uses as much as digits as its factorization.

111171731161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 882, while the sum is 31.

The spelling of 111171731161 in words is "one hundred eleven billion, one hundred seventy-one million, seven hundred thirty-one thousand, one hundred sixty-one".