90169521 has 16 divisors (see below), whose sum is σ = 129730944. Its totient is φ = 55378944.

The previous prime is 90169507. The next prime is 90169531. The reversal of 90169521 is 12596109.

It is not a de Polignac number, because 90169521 - 2⁵ = 90169489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90169531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20500 + ... + 24506.

It is an arithmetic number, because the mean of its divisors is an integer number (8108184).

Almost surely, 2^90169521 is an apocalyptic number.

It is an amenable number.

90169521 is a deficient number, since it is larger than the sum of its proper divisors (39561423).

90169521 is a wasteful number, since it uses less digits than its factorization.

90169521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4600.

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

The square root of 90169521 is about 9495.7633184489. The cubic root of 90169521 is about 448.4216656689.

The spelling of 90169521 in words is "ninety million, one hundred sixty-nine thousand, five hundred twenty-one".