117817 has 4 divisors (see below), whose sum is σ = 134656. Its totient is φ = 100980.

The previous prime is 117811. The next prime is 117833. The reversal of 117817 is 718711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 718711 = 7 ⋅102673.

It is a cyclic number.

It is not a de Polignac number, because 117817 - 2³ = 117809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117791 and 117800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117811) 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, 8409 + ... + 8422.

It is an arithmetic number, because the mean of its divisors is an integer number (33664).

2¹¹⁷⁸¹⁷ is an apocalyptic number.

It is an amenable number.

117817 is a deficient number, since it is larger than the sum of its proper divisors (16839).

117817 is an equidigital number, since it uses as much as digits as its factorization.

117817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16838.

The product of its digits is 392, while the sum is 25.

The square root of 117817 is about 343.2448105944. The cubic root of 117817 is about 49.0233125221.

The spelling of 117817 in words is "one hundred seventeen thousand, eight hundred seventeen".