2125709 has 4 divisors (see below), whose sum is σ = 2157504. Its totient is φ = 2093916.

The previous prime is 2125703. The next prime is 2125733. The reversal of 2125709 is 9075212.

2125709 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, 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 2125709 - 2⁴ = 2125693 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125703) 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, 15797 + ... + 15930.

It is an arithmetic number, because the mean of its divisors is an integer number (539376).

2^2125709 is an apocalyptic number.

It is an amenable number.

2125709 is a deficient number, since it is larger than the sum of its proper divisors (31795).

2125709 is an equidigital number, since it uses as much as digits as its factorization.

2125709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31794.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 2125709 is about 1457.9811384240. The cubic root of 2125709 is about 128.5783762853.

The spelling of 2125709 in words is "two million, one hundred twenty-five thousand, seven hundred nine".