811853 has 4 divisors (see below), whose sum is σ = 927840. Its totient is φ = 695868.

The previous prime is 811819. The next prime is 811861. The reversal of 811853 is 358118.

811853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811853 - 2¹² = 807757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811253) 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, 57983 + ... + 57996.

It is an arithmetic number, because the mean of its divisors is an integer number (231960).

2⁸¹¹⁸⁵³ is an apocalyptic number.

It is an amenable number.

811853 is a deficient number, since it is larger than the sum of its proper divisors (115987).

811853 is a wasteful number, since it uses less digits than its factorization.

811853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115986.

The product of its digits is 960, while the sum is 26.

The square root of 811853 is about 901.0288563637. The cubic root of 811853 is about 93.2880037818.

The spelling of 811853 in words is "eight hundred eleven thousand, eight hundred fifty-three".