809819955 has 48 divisors (see below), whose sum is σ = 1628200704. Its totient is φ = 364668480.

The previous prime is 809819891. The next prime is 809819963. The reversal of 809819955 is 559918908.

809819955 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809819955 - 2⁶ = 809819891 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1920 + ... + 40290.

It is an arithmetic number, because the mean of its divisors is an integer number (33920848).

Almost surely, 2^809819955 is an apocalyptic number.

809819955 is an abundant number, since it is smaller than the sum of its proper divisors (818380749).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809819955 is a wasteful number, since it uses less digits than its factorization.

809819955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38456 (or 38453 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The square root of 809819955 is about 28457.3356974963. The cubic root of 809819955 is about 932.1006797945.

The spelling of 809819955 in words is "eight hundred nine million, eight hundred nineteen thousand, nine hundred fifty-five".