91000171 has 2 divisors, whose sum is σ = 91000172. Its totient is φ = 91000170.

The previous prime is 91000163. The next prime is 91000181. The reversal of 91000171 is 17100019.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91000171 - 2³ = 91000163 is a prime.

It is a super-2 number, since 2×91000171² = 16562062244058482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91000181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45500085 + 45500086.

It is an arithmetic number, because the mean of its divisors is an integer number (45500086).

Almost surely, 2^91000171 is an apocalyptic number.

91000171 is a deficient number, since it is larger than the sum of its proper divisors (1).

91000171 is an equidigital number, since it uses as much as digits as its factorization.

91000171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 19.

The square root of 91000171 is about 9539.4009770006. The cubic root of 91000171 is about 449.7944262666.

The spelling of 91000171 in words is "ninety-one million, one hundred seventy-one", and thus it is an aban number.