2081090009 has 2 divisors, whose sum is σ = 2081090010. Its totient is φ = 2081090008.

The previous prime is 2081089981. The next prime is 2081090041. The reversal of 2081090009 is 9000901802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1379899609 + 701190400 = 37147^2 + 26480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081090009 - 2²⁴ = 2064312793 is a prime.

It is not a weakly prime, because it can be changed into another prime (2081090509) 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, 1040545004 + 1040545005.

It is an arithmetic number, because the mean of its divisors is an integer number (1040545005).

Almost surely, 2^2081090009 is an apocalyptic number.

It is an amenable number.

2081090009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081090009 is an equidigital number, since it uses as much as digits as its factorization.

2081090009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2081090009 is about 45618.9654529780. The cubic root of 2081090009 is about 1276.7238011896.

The spelling of 2081090009 in words is "two billion, eighty-one million, ninety thousand, nine".