808821899 has 8 divisors (see below), whose sum is σ = 835261440. Its totient is φ = 782404200.

The previous prime is 808821889. The next prime is 808821911. The reversal of 808821899 is 998128808.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 808821899 - 2¹⁶ = 808756363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 808821899.

It is not an unprimeable number, because it can be changed into a prime (808821859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106664 + ... + 113994.

It is an arithmetic number, because the mean of its divisors is an integer number (104407680).

Almost surely, 2^808821899 is an apocalyptic number.

808821899 is a deficient number, since it is larger than the sum of its proper divisors (26439541).

808821899 is a wasteful number, since it uses less digits than its factorization.

808821899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921.

The product of its (nonzero) digits is 663552, while the sum is 53.

The square root of 808821899 is about 28439.7942854726. The cubic root of 808821899 is about 931.7176024172.

The spelling of 808821899 in words is "eight hundred eight million, eight hundred twenty-one thousand, eight hundred ninety-nine".