90475221 has 4 divisors (see below), whose sum is σ = 120633632. Its totient is φ = 60316812.

The previous prime is 90475213. The next prime is 90475237. The reversal of 90475221 is 12257409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12257409 = 3 ⋅4085803.

It is not a de Polignac number, because 90475221 - 2³ = 90475213 is a prime.

It is a super-2 number, since 2×90475221² = 16371531229997682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90475291) 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 3 ways as a sum of consecutive naturals, for example, 15079201 + ... + 15079206.

It is an arithmetic number, because the mean of its divisors is an integer number (30158408).

Almost surely, 2^90475221 is an apocalyptic number.

It is an amenable number.

90475221 is a deficient number, since it is larger than the sum of its proper divisors (30158411).

90475221 is a wasteful number, since it uses less digits than its factorization.

90475221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30158410.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 90475221 is about 9511.8463507355. The cubic root of 90475221 is about 448.9278525220.

The spelling of 90475221 in words is "ninety million, four hundred seventy-five thousand, two hundred twenty-one".