811161 has 16 divisors (see below), whose sum is σ = 1294720. Its totient is φ = 498960.

The previous prime is 811157. The next prime is 811163. The reversal of 811161 is 161118.

It is not a de Polignac number, because 811161 - 2² = 811157 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805 + ... + 1506.

It is an arithmetic number, because the mean of its divisors is an integer number (80920).

2⁸¹¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

811161 is a deficient number, since it is larger than the sum of its proper divisors (483559).

811161 is a wasteful number, since it uses less digits than its factorization.

811161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333 (or 2327 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 811161 is about 900.6447690405. The cubic root of 811161 is about 93.2614909160.

Adding to 811161 its reverse (161118), we get a palindrome (972279).

The spelling of 811161 in words is "eight hundred eleven thousand, one hundred sixty-one".