8640091 has 4 divisors (see below), whose sum is σ = 8676184. Its totient is φ = 8604000.

The previous prime is 8640059. The next prime is 8640109. The reversal of 8640091 is 1900468.

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 8640091 - 2⁵ = 8640059 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8640001) 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 3 ways as a sum of consecutive naturals, for example, 17685 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (2169046).

Almost surely, 2^8640091 is an apocalyptic number.

8640091 is a deficient number, since it is larger than the sum of its proper divisors (36093).

8640091 is a wasteful number, since it uses less digits than its factorization.

8640091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36092.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 8640091 is about 2939.4031707134. The cubic root of 8640091 is about 205.1978340052.

The spelling of 8640091 in words is "eight million, six hundred forty thousand, ninety-one".