2125909 has 4 divisors (see below), whose sum is σ = 2183404. Its totient is φ = 2068416.

The previous prime is 2125889. The next prime is 2125919. The reversal of 2125909 is 9095212.

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 1747684 + 378225 = 1322^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125909 - 2¹⁵ = 2093141 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125919) 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, 28692 + ... + 28765.

It is an arithmetic number, because the mean of its divisors is an integer number (545851).

2^2125909 is an apocalyptic number.

It is an amenable number.

2125909 is a deficient number, since it is larger than the sum of its proper divisors (57495).

2125909 is an equidigital number, since it uses as much as digits as its factorization.

2125909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57494.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 2125909 is about 1458.0497248037. The cubic root of 2125909 is about 128.5824086449.

The spelling of 2125909 in words is "two million, one hundred twenty-five thousand, nine hundred nine".