91110031171 has 2 divisors, whose sum is σ = 91110031172. Its totient is φ = 91110031170.

The previous prime is 91110031163. The next prime is 91110031231. The reversal of 91110031171 is 17113001119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91110031171 - 2³ = 91110031163 is a prime.

It is not a weakly prime, because it can be changed into another prime (91110031141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45555015585 + 45555015586.

It is an arithmetic number, because the mean of its divisors is an integer number (45555015586).

Almost surely, 2^91110031171 is an apocalyptic number.

91110031171 is a deficient number, since it is larger than the sum of its proper divisors (1).

91110031171 is an equidigital number, since it uses as much as digits as its factorization.

91110031171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189, while the sum is 25.

The spelling of 91110031171 in words is "ninety-one billion, one hundred ten million, thirty-one thousand, one hundred seventy-one".