90555589 has 2 divisors, whose sum is σ = 90555590. Its totient is φ = 90555588.

The previous prime is 90555587. The next prime is 90555599. The reversal of 90555589 is 98555509.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89151364 + 1404225 = 9442^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 90555589 - 2¹ = 90555587 is a prime.

Together with 90555587, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90555587) 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 as a sum of consecutive naturals, namely, 45277794 + 45277795.

It is an arithmetic number, because the mean of its divisors is an integer number (45277795).

Almost surely, 2^90555589 is an apocalyptic number.

It is an amenable number.

90555589 is a deficient number, since it is larger than the sum of its proper divisors (1).

90555589 is an equidigital number, since it uses as much as digits as its factorization.

90555589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 46.

The square root of 90555589 is about 9516.0700396750. The cubic root of 90555589 is about 449.0607388363.

The spelling of 90555589 in words is "ninety million, five hundred fifty-five thousand, five hundred eighty-nine".