90171055 has 16 divisors (see below), whose sum is σ = 122663520. Its totient is φ = 63082368.

The previous prime is 90171031. The next prime is 90171089. The reversal of 90171055 is 55017109.

It is a cyclic number.

It is not a de Polignac number, because 90171055 - 2⁵ = 90171023 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 35272 + ... + 37741.

It is an arithmetic number, because the mean of its divisors is an integer number (7666470).

Almost surely, 2^90171055 is an apocalyptic number.

90171055 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

90171055 is a deficient number, since it is larger than the sum of its proper divisors (32492465).

90171055 is a wasteful number, since it uses less digits than its factorization.

90171055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73050.

The product of its (nonzero) digits is 1575, while the sum is 28.

The square root of 90171055 is about 9495.8440909695. The cubic root of 90171055 is about 448.4242085641.

The spelling of 90171055 in words is "ninety million, one hundred seventy-one thousand, fifty-five".