2009559 has 4 divisors (see below), whose sum is σ = 2679416. Its totient is φ = 1339704.

The previous prime is 2009543. The next prime is 2009593. The reversal of 2009559 is 9559002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2009559 - 2⁴ = 2009543 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009509) 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, 334924 + ... + 334929.

It is an arithmetic number, because the mean of its divisors is an integer number (669854).

2^2009559 is an apocalyptic number.

2009559 is a deficient number, since it is larger than the sum of its proper divisors (669857).

2009559 is an equidigital number, since it uses as much as digits as its factorization.

2009559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669856.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 2009559 is about 1417.5891506357. The cubic root of 2009559 is about 126.1925124672.

The spelling of 2009559 in words is "two million, nine thousand, five hundred fifty-nine".