811143 has 6 divisors (see below), whose sum is σ = 1171664. Its totient is φ = 540756.

The previous prime is 811127. The next prime is 811147. The reversal of 811143 is 341118.

It is not a de Polignac number, because 811143 - 2⁴ = 811127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45055 + ... + 45072.

2⁸¹¹¹⁴³ is an apocalyptic number.

811143 is a deficient number, since it is larger than the sum of its proper divisors (360521).

811143 is a wasteful number, since it uses less digits than its factorization.

811143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90133 (or 90130 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 811143 is about 900.6347761440. The cubic root of 811143 is about 93.2608010738.

It can be divided in two parts, 81114 and 3, that multiplied together give a palindrome (243342).

The spelling of 811143 in words is "eight hundred eleven thousand, one hundred forty-three".