90446221 has 4 divisors (see below), whose sum is σ = 90479200. Its totient is φ = 90413244.

The previous prime is 90446219. The next prime is 90446227. The reversal of 90446221 is 12264409.

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.

It is a cyclic number.

It is not a de Polignac number, because 90446221 - 2¹ = 90446219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90446221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90446227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11961 + ... + 17998.

It is an arithmetic number, because the mean of its divisors is an integer number (22619800).

Almost surely, 2^90446221 is an apocalyptic number.

It is an amenable number.

90446221 is a deficient number, since it is larger than the sum of its proper divisors (32979).

90446221 is a wasteful number, since it uses less digits than its factorization.

90446221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32978.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 90446221 is about 9510.3218136927. The cubic root of 90446221 is about 448.8798824856.

The spelling of 90446221 in words is "ninety million, four hundred forty-six thousand, two hundred twenty-one".