2188609 has 2 divisors, whose sum is σ = 2188610. Its totient is φ = 2188608.

The previous prime is 2188607. The next prime is 2188639. The reversal of 2188609 is 9068812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1507984 + 680625 = 1228^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188609 - 2¹ = 2188607 is a prime.

Together with 2188607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2188607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094304 + 1094305.

It is an arithmetic number, because the mean of its divisors is an integer number (1094305).

2^2188609 is an apocalyptic number.

It is an amenable number.

2188609 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188609 is an equidigital number, since it uses as much as digits as its factorization.

2188609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2188609 is about 1479.3948086971. The cubic root of 2188609 is about 129.8342858914.

The spelling of 2188609 in words is "two million, one hundred eighty-eight thousand, six hundred nine".