811156 has 12 divisors (see below), whose sum is σ = 1430100. Its totient is φ = 402560.

The previous prime is 811147. The next prime is 811157. The reversal of 811156 is 651118.

It can be written as a sum of positive squares in 2 ways, for example, as 115600 + 695556 = 340^2 + 834^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811157) by changing a digit.

811156 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85 + ... + 1276.

It is an arithmetic number, because the mean of its divisors is an integer number (119175).

2⁸¹¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

811156 is a deficient number, since it is larger than the sum of its proper divisors (618944).

811156 is a wasteful number, since it uses less digits than its factorization.

811156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514 (or 1512 counting only the distinct ones).

The product of its digits is 240, while the sum is 22.

The square root of 811156 is about 900.6419932470. The cubic root of 811156 is about 93.2612992942.

It can be divided in two parts, 81 and 1156, that multiplied together give a square (93636 = 306²).

The spelling of 811156 in words is "eight hundred eleven thousand, one hundred fifty-six".