809119205 has 6 divisors (see below), whose sum is σ = 971019378. Its totient is φ = 647244480.

The previous prime is 809119187. The next prime is 809119217. The reversal of 809119205 is 502911908.

809119205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 376437604 + 432681601 = 19402^2 + 20801^2 .

It is not a de Polignac number, because 809119205 - 2⁸ = 809118949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 57245 + ... + 69965.

It is an arithmetic number, because the mean of its divisors is an integer number (161836563).

Almost surely, 2^809119205 is an apocalyptic number.

It is an amenable number.

809119205 is a deficient number, since it is larger than the sum of its proper divisors (161900173).

809119205 is an frugal number, since it uses more digits than its factorization.

809119205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25447 (or 12726 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 809119205 is about 28445.0207417748. The cubic root of 809119205 is about 931.8317483951.

Multiplying 809119205 by its product of nonzero digits (6480), we get a square (5243092448400 = 2289780²).

The spelling of 809119205 in words is "eight hundred nine million, one hundred nineteen thousand, two hundred five".