2128109 has 4 divisors (see below), whose sum is σ = 2168316. Its totient is φ = 2087904.

The previous prime is 2128103. The next prime is 2128153. The reversal of 2128109 is 9018212.

2128109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1357225 + 770884 = 1165^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128109 - 2¹² = 2124013 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 (2128103) 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 3 ways as a sum of consecutive naturals, for example, 20024 + ... + 20129.

It is an arithmetic number, because the mean of its divisors is an integer number (542079).

2^2128109 is an apocalyptic number.

It is an amenable number.

2128109 is a deficient number, since it is larger than the sum of its proper divisors (40207).

2128109 is an equidigital number, since it uses as much as digits as its factorization.

2128109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40206.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2128109 is about 1458.8039621553. The cubic root of 2128109 is about 128.6267479173.

The spelling of 2128109 in words is "two million, one hundred twenty-eight thousand, one hundred nine".