8109989 has 4 divisors (see below), whose sum is σ = 8169324. Its totient is φ = 8050656.

The previous prime is 8109973. The next prime is 8110009. The reversal of 8109989 is 9899018.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3940225 + 4169764 = 1985^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 8109989 - 2⁴ = 8109973 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8109089) 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, 29462 + ... + 29735.

It is an arithmetic number, because the mean of its divisors is an integer number (2042331).

Almost surely, 2^8109989 is an apocalyptic number.

It is an amenable number.

8109989 is a deficient number, since it is larger than the sum of its proper divisors (59335).

8109989 is a wasteful number, since it uses less digits than its factorization.

8109989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59334.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 8109989 is about 2847.8042418678. The cubic root of 8109989 is about 200.9124062445.

The spelling of 8109989 in words is "eight million, one hundred nine thousand, nine hundred eighty-nine".