91090171 has 2 divisors, whose sum is σ = 91090172. Its totient is φ = 91090170.

The previous prime is 91090163. The next prime is 91090201. The reversal of 91090171 is 17109019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91090171 - 2³ = 91090163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91090271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45545085 + 45545086.

It is an arithmetic number, because the mean of its divisors is an integer number (45545086).

Almost surely, 2^91090171 is an apocalyptic number.

91090171 is a deficient number, since it is larger than the sum of its proper divisors (1).

91090171 is an equidigital number, since it uses as much as digits as its factorization.

91090171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 91090171 is about 9544.1170885525. The cubic root of 91090171 is about 449.9426610069.

The spelling of 91090171 in words is "ninety-one million, ninety thousand, one hundred seventy-one".