90055171 has 4 divisors (see below), whose sum is σ = 95352552. Its totient is φ = 84757792.

The previous prime is 90055157. The next prime is 90055187. The reversal of 90055171 is 17155009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90055171 - 2⁵ = 90055139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90055111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648665 + ... + 2648698.

It is an arithmetic number, because the mean of its divisors is an integer number (23838138).

Almost surely, 2^90055171 is an apocalyptic number.

90055171 is a deficient number, since it is larger than the sum of its proper divisors (5297381).

90055171 is a wasteful number, since it uses less digits than its factorization.

90055171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5297380.

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

The square root of 90055171 is about 9489.7403020315. The cubic root of 90055171 is about 448.2320276474.

The spelling of 90055171 in words is "ninety million, fifty-five thousand, one hundred seventy-one".