117509 has 4 divisors (see below), whose sum is σ = 134304. Its totient is φ = 100716.

The previous prime is 117503. The next prime is 117511. The reversal of 117509 is 905711.

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.

It is not a de Polignac number, because 117509 - 2¹⁶ = 51973 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117503) 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, 8387 + ... + 8400.

It is an arithmetic number, because the mean of its divisors is an integer number (33576).

2¹¹⁷⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

117509 is a deficient number, since it is larger than the sum of its proper divisors (16795).

117509 is an equidigital number, since it uses as much as digits as its factorization.

117509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16794.

The product of its (nonzero) digits is 315, while the sum is 23.

The square root of 117509 is about 342.7958576179. The cubic root of 117509 is about 48.9805559393.

It can be divided in two parts, 117 and 509, that added together give a palindrome (626).

The spelling of 117509 in words is "one hundred seventeen thousand, five hundred nine".