90591089 has 4 divisors (see below), whose sum is σ = 94529856. Its totient is φ = 86652324.

The previous prime is 90591077. The next prime is 90591131. The reversal of 90591089 is 98019509.

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 a de Polignac number, because none of the positive numbers 2^k-90591089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90591049) 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, 1969349 + ... + 1969394.

It is an arithmetic number, because the mean of its divisors is an integer number (23632464).

Almost surely, 2^90591089 is an apocalyptic number.

It is an amenable number.

90591089 is a deficient number, since it is larger than the sum of its proper divisors (3938767).

90591089 is a wasteful number, since it uses less digits than its factorization.

90591089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938766.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 90591089 is about 9517.9351227039. The cubic root of 90591089 is about 449.1194120914.

The spelling of 90591089 in words is "ninety million, five hundred ninety-one thousand, eighty-nine".