8591989 has 8 divisors (see below), whose sum is σ = 10005120. Its totient is φ = 7225296.

The previous prime is 8591963. The next prime is 8592043. The reversal of 8591989 is 9891958.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8591989 - 2²¹ = 6494837 is a prime.

It is a super-2 number, since 2×8591989² = 147644549952242, which contains 22 as substring.

It is a Duffinian number.

8591989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8591909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11209 + ... + 11950.

It is an arithmetic number, because the mean of its divisors is an integer number (1250640).

Almost surely, 2^8591989 is an apocalyptic number.

It is an amenable number.

8591989 is a deficient number, since it is larger than the sum of its proper divisors (1413131).

8591989 is a wasteful number, since it uses less digits than its factorization.

8591989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23219.

The product of its digits is 233280, while the sum is 49.

The square root of 8591989 is about 2931.2094773318. The cubic root of 8591989 is about 204.8163256664.

The spelling of 8591989 in words is "eight million, five hundred ninety-one thousand, nine hundred eighty-nine".