811117 has 4 divisors (see below), whose sum is σ = 824476. Its totient is φ = 797760.

The previous prime is 811099. The next prime is 811123. The reversal of 811117 is 711118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 711118 = 2 ⋅355559.

It can be written as a sum of positive squares in 2 ways, for example, as 11881 + 799236 = 109^2 + 894^2 .

It is a cyclic number.

It is not a de Polignac number, because 811117 - 2⁷ = 810989 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 811094 and 811103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811127) 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, 6588 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (206119).

2⁸¹¹¹¹⁷ is an apocalyptic number.

It is an amenable number.

811117 is a deficient number, since it is larger than the sum of its proper divisors (13359).

811117 is a wasteful number, since it uses less digits than its factorization.

811117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13358.

The product of its digits is 56, while the sum is 19.

The square root of 811117 is about 900.6203417645. The cubic root of 811117 is about 93.2598046171.

Subtracting from 811117 its reverse (711118), we obtain a palindrome (99999).

It can be divided in two parts, 81111 and 7, that added together give a palindrome (81118).

The spelling of 811117 in words is "eight hundred eleven thousand, one hundred seventeen".