90488221 has 4 divisors (see below), whose sum is σ = 90569500. Its totient is φ = 90406944.

The previous prime is 90488213. The next prime is 90488267. The reversal of 90488221 is 12288409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12288409 = 7 ⋅1755487.

It can be written as a sum of positive squares in 2 ways, for example, as 50608996 + 39879225 = 7114^2 + 6315^2 .

It is a cyclic number.

It is not a de Polignac number, because 90488221 - 2³ = 90488213 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 (90488291) 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, 38946 + ... + 41203.

It is an arithmetic number, because the mean of its divisors is an integer number (22642375).

Almost surely, 2^90488221 is an apocalyptic number.

It is an amenable number.

90488221 is a deficient number, since it is larger than the sum of its proper divisors (81279).

90488221 is a wasteful number, since it uses less digits than its factorization.

90488221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81278.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 90488221 is about 9512.5296845792. The cubic root of 90488221 is about 448.9493530041.

It can be divided in two parts, 90488 and 221, that added together give a palindrome (90709).

The spelling of 90488221 in words is "ninety million, four hundred eighty-eight thousand, two hundred twenty-one".