2566209 has 16 divisors (see below), whose sum is σ = 3581120. Its totient is φ = 1632960.

The previous prime is 2566199. The next prime is 2566219. The reversal of 2566209 is 9026652.

It is an interprime number because it is at equal distance from previous prime (2566199) and next prime (2566219).

It is not a de Polignac number, because 2566209 - 2⁵ = 2566177 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 (2566219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6582 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (223820).

2^2566209 is an apocalyptic number.

It is an amenable number.

2566209 is a deficient number, since it is larger than the sum of its proper divisors (1014911).

2566209 is a wasteful number, since it uses less digits than its factorization.

2566209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 2566209 is about 1601.9391374206. The cubic root of 2566209 is about 136.9085826982.

It can be divided in two parts, 2566 and 209, that added together give a triangular number (2775 = T₇₄).

The spelling of 2566209 in words is "two million, five hundred sixty-six thousand, two hundred nine".