90004591 has 4 divisors (see below), whose sum is σ = 90051232. Its totient is φ = 89957952.

The previous prime is 90004573. The next prime is 90004597. The reversal of 90004591 is 19540009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90004591 - 2¹⁵ = 89971823 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 (90004597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20295 + ... + 24328.

It is an arithmetic number, because the mean of its divisors is an integer number (22512808).

Almost surely, 2^90004591 is an apocalyptic number.

90004591 is a deficient number, since it is larger than the sum of its proper divisors (46641).

90004591 is a wasteful number, since it uses less digits than its factorization.

90004591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46640.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 90004591 is about 9487.0749443651. The cubic root of 90004591 is about 448.1480945740.

The spelling of 90004591 in words is "ninety million, four thousand, five hundred ninety-one".