90310521 has 16 divisors (see below), whose sum is σ = 137769984. Its totient is φ = 51548304.

The previous prime is 90310499. The next prime is 90310529. The reversal of 90310521 is 12501309.

It is not a de Polignac number, because 90310521 - 2⁷ = 90310393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90310529) 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 15 ways as a sum of consecutive naturals, for example, 23116 + ... + 26738.

It is an arithmetic number, because the mean of its divisors is an integer number (8610624).

Almost surely, 2^90310521 is an apocalyptic number.

It is an amenable number.

90310521 is a deficient number, since it is larger than the sum of its proper divisors (47459463).

90310521 is a wasteful number, since it uses less digits than its factorization.

90310521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 90310521 is about 9503.1847819560. The cubic root of 90310521 is about 448.6552794446.

The spelling of 90310521 in words is "ninety million, three hundred ten thousand, five hundred twenty-one".