80209191109 has 2 divisors, whose sum is σ = 80209191110. Its totient is φ = 80209191108.

The previous prime is 80209191103. The next prime is 80209191187. The reversal of 80209191109 is 90119190208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42610042084 + 37599149025 = 206422^2 + 193905^2 .

It is a cyclic number.

It is not a de Polignac number, because 80209191109 - 2⁵ = 80209191077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80209191103) 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, 40104595554 + 40104595555.

It is an arithmetic number, because the mean of its divisors is an integer number (40104595555).

Almost surely, 2^80209191109 is an apocalyptic number.

It is an amenable number.

80209191109 is a deficient number, since it is larger than the sum of its proper divisors (1).

80209191109 is an equidigital number, since it uses as much as digits as its factorization.

80209191109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 40.

Subtracting 80209191109 from its reverse (90119190208), we obtain a palindrome (9909999099).

The spelling of 80209191109 in words is "eighty billion, two hundred nine million, one hundred ninety-one thousand, one hundred nine".