90171015 has 24 divisors (see below), whose sum is σ = 158584944. Its totient is φ = 43718400.

The previous prime is 90170981. The next prime is 90171023. The reversal of 90171015 is 51017109.

It is not a de Polignac number, because 90171015 - 2⁹ = 90170503 is a prime.

It is a super-2 number, since 2×90171015² = 16261623892260450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23026 + ... + 26655.

It is an arithmetic number, because the mean of its divisors is an integer number (6607706).

Almost surely, 2^90171015 is an apocalyptic number.

90171015 is a deficient number, since it is larger than the sum of its proper divisors (68413929).

90171015 is a wasteful number, since it uses less digits than its factorization.

90171015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49711 (or 49700 counting only the distinct ones).

The product of its (nonzero) digits is 315, while the sum is 24.

The square root of 90171015 is about 9495.8419847847. The cubic root of 90171015 is about 448.4241422569.

The spelling of 90171015 in words is "ninety million, one hundred seventy-one thousand, fifteen".