90045221 has 8 divisors (see below), whose sum is σ = 103282560. Its totient is φ = 76901328.

The previous prime is 90045217. The next prime is 90045229. The reversal of 90045221 is 12254009.

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

It is not a de Polignac number, because 90045221 - 2² = 90045217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90045229) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21281 + ... + 25158.

It is an arithmetic number, because the mean of its divisors is an integer number (12910320).

Almost surely, 2^90045221 is an apocalyptic number.

It is an amenable number.

90045221 is a deficient number, since it is larger than the sum of its proper divisors (13237339).

90045221 is a wasteful number, since it uses less digits than its factorization.

90045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46723.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 90045221 is about 9489.2160371656. The cubic root of 90045221 is about 448.2155189787.

The spelling of 90045221 in words is "ninety million, forty-five thousand, two hundred twenty-one".