801559 has 4 divisors (see below), whose sum is σ = 874440. Its totient is φ = 728680.

The previous prime is 801557. The next prime is 801569. The reversal of 801559 is 955108.

801559 = 363² + 364² + ... + 368².

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 801559 - 2¹ = 801557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801551) 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 in 3 ways as a sum of consecutive naturals, for example, 36424 + ... + 36445.

It is an arithmetic number, because the mean of its divisors is an integer number (218610).

2⁸⁰¹⁵⁵⁹ is an apocalyptic number.

801559 is a deficient number, since it is larger than the sum of its proper divisors (72881).

801559 is a wasteful number, since it uses less digits than its factorization.

801559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72880.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 801559 is about 895.2982743198. The cubic root of 801559 is about 92.8920395184.

The spelling of 801559 in words is "eight hundred one thousand, five hundred fifty-nine".