90591728171 has 12 divisors (see below), whose sum is σ = 105391436832. Its totient is φ = 77643257328.

The previous prime is 90591728159. The next prime is 90591728177. The reversal of 90591728171 is 17182719509.

It is a happy number.

It is not a de Polignac number, because 90591728171 - 2⁶ = 90591728107 is a prime.

It is a super-2 number, since 2×90591728171² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90591728177) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 531566 + ... + 680988.

It is an arithmetic number, because the mean of its divisors is an integer number (8782619736).

Almost surely, 2^90591728171 is an apocalyptic number.

90591728171 is a deficient number, since it is larger than the sum of its proper divisors (14799708661).

90591728171 is a wasteful number, since it uses less digits than its factorization.

90591728171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161810 (or 161803 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 50.

The spelling of 90591728171 in words is "ninety billion, five hundred ninety-one million, seven hundred twenty-eight thousand, one hundred seventy-one".