90004091 has 4 divisors (see below), whose sum is σ = 92436672. Its totient is φ = 87571512.

The previous prime is 90004063. The next prime is 90004093. The reversal of 90004091 is 19040009.

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 90004091 - 2¹⁸ = 89741947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90004093) 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, 1216235 + ... + 1216308.

It is an arithmetic number, because the mean of its divisors is an integer number (23109168).

Almost surely, 2^90004091 is an apocalyptic number.

90004091 is a deficient number, since it is larger than the sum of its proper divisors (2432581).

90004091 is a wasteful number, since it uses less digits than its factorization.

90004091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432580.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 90004091 is about 9487.0485926868. The cubic root of 90004091 is about 448.1472647109.

The spelling of 90004091 in words is "ninety million, four thousand, ninety-one".