2081909309 has 2 divisors, whose sum is σ = 2081909310. Its totient is φ = 2081909308.

The previous prime is 2081909293. The next prime is 2081909327. The reversal of 2081909309 is 9039091802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2054083684 + 27825625 = 45322^2 + 5275^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081909309 - 2⁴ = 2081909293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081909339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040954654 + 1040954655.

It is an arithmetic number, because the mean of its divisors is an integer number (1040954655).

Almost surely, 2^2081909309 is an apocalyptic number.

It is an amenable number.

2081909309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081909309 is an equidigital number, since it uses as much as digits as its factorization.

2081909309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 2081909309 is about 45627.9443871845. The cubic root of 2081909309 is about 1276.8913227876.

The spelling of 2081909309 in words is "two billion, eighty-one million, nine hundred nine thousand, three hundred nine".