811281 has 16 divisors (see below), whose sum is σ = 1168640. Its totient is φ = 498960.

The previous prime is 811277. The next prime is 811289. The reversal of 811281 is 182118.

It is not a de Polignac number, because 811281 - 2² = 811277 is a prime.

It is a super-2 number, since 2×811281² = 1316353721922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 811281.

It is not an unprimeable number, because it can be changed into a prime (811289) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2286 + ... + 2616.

It is an arithmetic number, because the mean of its divisors is an integer number (73040).

2⁸¹¹²⁸¹ is an apocalyptic number.

It is an amenable number.

811281 is a deficient number, since it is larger than the sum of its proper divisors (357359).

811281 is a wasteful number, since it uses less digits than its factorization.

811281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396.

The product of its digits is 128, while the sum is 21.

The square root of 811281 is about 900.7113855170. The cubic root of 811281 is about 93.2660896032.

Adding to 811281 its reverse (182118), we get a palindrome (993399).

The spelling of 811281 in words is "eight hundred eleven thousand, two hundred eighty-one".