117971 has 8 divisors (see below), whose sum is σ = 142080. Its totient is φ = 95688.

The previous prime is 117959. The next prime is 117973. The reversal of 117971 is 179711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117971.

It is not an unprimeable number, because it can be changed into a prime (117973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311 + ... + 576.

It is an arithmetic number, because the mean of its divisors is an integer number (17760).

2¹¹⁷⁹⁷¹ is an apocalyptic number.

117971 is a deficient number, since it is larger than the sum of its proper divisors (24109).

117971 is an equidigital number, since it uses as much as digits as its factorization.

117971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913.

The product of its digits is 441, while the sum is 26.

The square root of 117971 is about 343.4690670206. The cubic root of 117971 is about 49.0446628737.

The spelling of 117971 in words is "one hundred seventeen thousand, nine hundred seventy-one".