2081908909 has 2 divisors, whose sum is σ = 2081908910. Its totient is φ = 2081908908.

The previous prime is 2081908901. The next prime is 2081908919. The reversal of 2081908909 is 9098091802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140953284 + 940955625 = 33778^2 + 30675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081908909 - 2³ = 2081908901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081908901) 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 as a sum of consecutive naturals, namely, 1040954454 + 1040954455.

It is an arithmetic number, because the mean of its divisors is an integer number (1040954455).

Almost surely, 2^2081908909 is an apocalyptic number.

It is an amenable number.

2081908909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081908909 is an equidigital number, since it uses as much as digits as its factorization.

2081908909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 2081908909 is about 45627.9400039055. The cubic root of 2081908909 is about 1276.8912410107.

The spelling of 2081908909 in words is "two billion, eighty-one million, nine hundred eight thousand, nine hundred nine".