90907221 has 16 divisors (see below), whose sum is σ = 125616128. Its totient is φ = 58417200.

The previous prime is 90907217. The next prime is 90907231. The reversal of 90907221 is 12270909.

It is not a de Polignac number, because 90907221 - 2² = 90907217 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 (90907231) 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 15 ways as a sum of consecutive naturals, for example, 23400 + ... + 27006.

It is an arithmetic number, because the mean of its divisors is an integer number (7851008).

Almost surely, 2^90907221 is an apocalyptic number.

It is an amenable number.

90907221 is a deficient number, since it is larger than the sum of its proper divisors (34708907).

90907221 is a wasteful number, since it uses less digits than its factorization.

90907221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 90907221 is about 9534.5278330917. The cubic root of 90907221 is about 449.6412300902.

The spelling of 90907221 in words is "ninety million, nine hundred seven thousand, two hundred twenty-one".