90619521 has 8 divisors (see below), whose sum is σ = 121695840. Its totient is φ = 59978112.

The previous prime is 90619513. The next prime is 90619547. The reversal of 90619521 is 12591609.

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

It is not a de Polignac number, because 90619521 - 2³ = 90619513 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90619561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108240 + ... + 109073.

It is an arithmetic number, because the mean of its divisors is an integer number (15211980).

Almost surely, 2^90619521 is an apocalyptic number.

It is an amenable number.

90619521 is a deficient number, since it is larger than the sum of its proper divisors (31076319).

90619521 is a wasteful number, since it uses less digits than its factorization.

90619521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217455.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 90619521 is about 9519.4286068020. The cubic root of 90619521 is about 449.1663925306.

The spelling of 90619521 in words is "ninety million, six hundred nineteen thousand, five hundred twenty-one".