805559 has 2 divisors, whose sum is σ = 805560. Its totient is φ = 805558.

The previous prime is 805537. The next prime is 805573. The reversal of 805559 is 955508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805559 - 2¹⁶ = 740023 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402779 + 402780.

It is an arithmetic number, because the mean of its divisors is an integer number (402780).

2⁸⁰⁵⁵⁵⁹ is an apocalyptic number.

805559 is a deficient number, since it is larger than the sum of its proper divisors (1).

805559 is an equidigital number, since it uses as much as digits as its factorization.

805559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 805559 is about 897.5293867055. The cubic root of 805559 is about 93.0463021450.

The spelling of 805559 in words is "eight hundred five thousand, five hundred fifty-nine".