2006771209 has 3 divisors (see below), whose sum is σ = 2006816007. Its totient is φ = 2006726412.

The previous prime is 2006771201. The next prime is 2006771213. The reversal of 2006771209 is 9021776002.

The square root of 2006771209 is 44797.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 595116025 + 1411655184 = 24395^2 + 37572^2 .

It is not a de Polignac number, because 2006771209 - 2³ = 2006771201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006771201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 22399 + ... + 67195.

It is an arithmetic number, because the mean of its divisors is an integer number (668938669).

Almost surely, 2^2006771209 is an apocalyptic number.

2006771209 is the 44797-th square number.

2006771209 is the 22399-th centered octagonal number.

It is an amenable number.

2006771209 is a deficient number, since it is larger than the sum of its proper divisors (44798).

2006771209 is an frugal number, since it uses more digits than its factorization.

2006771209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89594 (or 44797 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The cubic root of 2006771209 is about 1261.3413130743.

The spelling of 2006771209 in words is "two billion, six million, seven hundred seventy-one thousand, two hundred nine".