811256 has 16 divisors (see below), whose sum is σ = 1587600. Its totient is φ = 387904.

The previous prime is 811253. The next prime is 811259. The reversal of 811256 is 652118.

It is an interprime number because it is at equal distance from previous prime (811253) and next prime (811259).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a zygodrome in base 2.

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, 2021 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (99225).

2⁸¹¹²⁵⁶ is an apocalyptic number.

It is an amenable number.

811256 is a deficient number, since it is larger than the sum of its proper divisors (776344).

811256 is a wasteful number, since it uses less digits than its factorization.

811256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4438 (or 4434 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 811256 is about 900.6975074907. The cubic root of 811256 is about 93.2651315808.

The spelling of 811256 in words is "eight hundred eleven thousand, two hundred fifty-six".