90133521 has 8 divisors (see below), whose sum is σ = 120410784. Its totient is φ = 59972640.

The previous prime is 90133513. The next prime is 90133531. The reversal of 90133521 is 12533109.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90133521 - 2³ = 90133513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90133491 and 90133500.

It is not an unprimeable number, because it can be changed into a prime (90133501) 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 7 ways as a sum of consecutive naturals, for example, 27271 + ... + 30396.

It is an arithmetic number, because the mean of its divisors is an integer number (15051348).

Almost surely, 2^90133521 is an apocalyptic number.

It is an amenable number.

90133521 is a deficient number, since it is larger than the sum of its proper divisors (30277263).

90133521 is a wasteful number, since it uses less digits than its factorization.

90133521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58191.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 90133521 is about 9493.8675470011. The cubic root of 90133521 is about 448.3619805756.

The spelling of 90133521 in words is "ninety million, one hundred thirty-three thousand, five hundred twenty-one".