2006581209 has 16 divisors (see below), whose sum is σ = 2724546240. Its totient is φ = 1313231360.

The previous prime is 2006581207. The next prime is 2006581211. The reversal of 2006581209 is 9021856002.

It is an interprime number because it is at equal distance from previous prime (2006581207) and next prime (2006581211).

It is a cyclic number.

It is not a de Polignac number, because 2006581209 - 2¹ = 2006581207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2006581209.

It is not an unprimeable number, because it can be changed into a prime (2006581207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127249 + ... + 142145.

It is an arithmetic number, because the mean of its divisors is an integer number (170284140).

Almost surely, 2^2006581209 is an apocalyptic number.

It is an amenable number.

2006581209 is a deficient number, since it is larger than the sum of its proper divisors (717965031).

2006581209 is a wasteful number, since it uses less digits than its factorization.

2006581209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15720.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 2006581209 is about 44794.8792720775. The cubic root of 2006581209 is about 1261.3015041161.

The spelling of 2006581209 in words is "two billion, six million, five hundred eighty-one thousand, two hundred nine".