2001108209 has 2 divisors, whose sum is σ = 2001108210. Its totient is φ = 2001108208.

The previous prime is 2001108203. The next prime is 2001108269. The reversal of 2001108209 is 9028011002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1084714225 + 916393984 = 32935^2 + 30272^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001108209 - 2²⁴ = 1984330993 is a prime.

It is not a weakly prime, because it can be changed into another prime (2001108203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000554104 + 1000554105.

It is an arithmetic number, because the mean of its divisors is an integer number (1000554105).

Almost surely, 2^2001108209 is an apocalyptic number.

It is an amenable number.

2001108209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001108209 is an equidigital number, since it uses as much as digits as its factorization.

2001108209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2001108209 is about 44733.7479873976. The cubic root of 2001108209 is about 1260.1537162341.

The spelling of 2001108209 in words is "two billion, one million, one hundred eight thousand, two hundred nine".