800851 has 4 divisors (see below), whose sum is σ = 812872. Its totient is φ = 788832.

The previous prime is 800801. The next prime is 800861. The reversal of 800851 is 158008.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-800851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (800801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5910 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (203218).

2⁸⁰⁰⁸⁵¹ is an apocalyptic number.

800851 is a deficient number, since it is larger than the sum of its proper divisors (12021).

800851 is a wasteful number, since it uses less digits than its factorization.

800851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12020.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 800851 is about 894.9027880167. The cubic root of 800851 is about 92.8646816083.

Adding to 800851 its reverse (158008), we get a palindrome (958859).

The spelling of 800851 in words is "eight hundred thousand, eight hundred fifty-one".