805821059 has 4 divisors (see below), whose sum is σ = 806273280. Its totient is φ = 805368840.

The previous prime is 805821053. The next prime is 805821073. The reversal of 805821059 is 950128508.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 805821059 - 2⁴ = 805821043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805821053) 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 3 ways as a sum of consecutive naturals, for example, 223427 + ... + 227004.

It is an arithmetic number, because the mean of its divisors is an integer number (201568320).

Almost surely, 2^805821059 is an apocalyptic number.

805821059 is a deficient number, since it is larger than the sum of its proper divisors (452221).

805821059 is a wasteful number, since it uses less digits than its factorization.

805821059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452220.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 805821059 is about 28386.9874942728. The cubic root of 805821059 is about 930.5639078209.

The spelling of 805821059 in words is "eight hundred five million, eight hundred twenty-one thousand, fifty-nine".