805289 has 2 divisors, whose sum is σ = 805290. Its totient is φ = 805288.

The previous prime is 805279. The next prime is 805297. The reversal of 805289 is 982508.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 779689 + 25600 = 883^2 + 160^2 .

It is a cyclic number.

It is not a de Polignac number, because 805289 - 2⁸ = 805033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (805219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402644 + 402645.

It is an arithmetic number, because the mean of its divisors is an integer number (402645).

2⁸⁰⁵²⁸⁹ is an apocalyptic number.

It is an amenable number.

805289 is a deficient number, since it is larger than the sum of its proper divisors (1).

805289 is an equidigital number, since it uses as much as digits as its factorization.

805289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 805289 is about 897.3789611976. The cubic root of 805289 is about 93.0359055099.

The spelling of 805289 in words is "eight hundred five thousand, two hundred eighty-nine".