91440171 has 12 divisors (see below), whose sum is σ = 136972472. Its totient is φ = 60959952.

The previous prime is 91440169. The next prime is 91440191. The reversal of 91440171 is 17104419.

It is not a de Polignac number, because 91440171 - 2¹ = 91440169 is a prime.

It is a super-2 number, since 2×91440171² = 16722609745018482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91440121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187906 + ... + 188391.

Almost surely, 2^91440171 is an apocalyptic number.

91440171 is a deficient number, since it is larger than the sum of its proper divisors (45532301).

91440171 is an equidigital number, since it uses as much as digits as its factorization.

91440171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376312 (or 376300 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 91440171 is about 9562.4354115466. The cubic root of 91440171 is about 450.5182030279.

The spelling of 91440171 in words is "ninety-one million, four hundred forty thousand, one hundred seventy-one".