117815 has 4 divisors (see below), whose sum is σ = 141384. Its totient is φ = 94248.

The previous prime is 117811. The next prime is 117833. The reversal of 117815 is 518711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 518711 = 53 ⋅9787.

It is a cyclic number.

It is not a de Polignac number, because 117815 - 2² = 117811 is a prime.

It is a Duffinian number.

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, 11777 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (35346).

2¹¹⁷⁸¹⁵ is an apocalyptic number.

117815 is a deficient number, since it is larger than the sum of its proper divisors (23569).

117815 is an equidigital number, since it uses as much as digits as its factorization.

117815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23568.

The product of its digits is 280, while the sum is 23.

The square root of 117815 is about 343.2418972095. The cubic root of 117815 is about 49.0230351225.

The spelling of 117815 in words is "one hundred seventeen thousand, eight hundred fifteen".