850811 has 4 divisors (see below), whose sum is σ = 916272. Its totient is φ = 785352.

The previous prime is 850807. The next prime is 850823. The reversal of 850811 is 118058.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118058 = 2 ⋅59029.

It is a cyclic number.

It is not a de Polignac number, because 850811 - 2² = 850807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (850891) 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, 32711 + ... + 32736.

It is an arithmetic number, because the mean of its divisors is an integer number (229068).

2⁸⁵⁰⁸¹¹ is an apocalyptic number.

850811 is a deficient number, since it is larger than the sum of its proper divisors (65461).

850811 is a wasteful number, since it uses less digits than its factorization.

850811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65460.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 850811 is about 922.3941673710. The cubic root of 850811 is about 94.7569409869.

Adding to 850811 its reverse (118058), we get a palindrome (968869).

It can be divided in two parts, 850 and 811, that added together give a palindrome (1661).

The spelling of 850811 in words is "eight hundred fifty thousand, eight hundred eleven".