8128109 has 4 divisors (see below), whose sum is σ = 8867040. Its totient is φ = 7389180.

The previous prime is 8128069. The next prime is 8128111. The reversal of 8128109 is 9018218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8128109 - 2¹² = 8124013 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 (8128129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369449 + ... + 369470.

It is an arithmetic number, because the mean of its divisors is an integer number (2216760).

Almost surely, 2^8128109 is an apocalyptic number.

It is an amenable number.

8128109 is a deficient number, since it is larger than the sum of its proper divisors (738931).

8128109 is a wasteful number, since it uses less digits than its factorization.

8128109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738930.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 8128109 is about 2850.9838652648. The cubic root of 8128109 is about 201.0619265803.

The spelling of 8128109 in words is "eight million, one hundred twenty-eight thousand, one hundred nine".