117681 has 4 divisors (see below), whose sum is σ = 156912. Its totient is φ = 78452.

The previous prime is 117679. The next prime is 117701. The reversal of 117681 is 186711.

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 a cyclic number.

It is not a de Polignac number, because 117681 - 2¹ = 117679 is a prime.

It is a super-2 number, since 2×117681² = 27697635522, which contains 22 as substring.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 117681.

It is not an unprimeable number, because it can be changed into a prime (117671) 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, 19611 + ... + 19616.

It is an arithmetic number, because the mean of its divisors is an integer number (39228).

2¹¹⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

117681 is a deficient number, since it is larger than the sum of its proper divisors (39231).

117681 is an equidigital number, since it uses as much as digits as its factorization.

117681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39230.

The product of its digits is 336, while the sum is 24.

The square root of 117681 is about 343.0466440588. The cubic root of 117681 is about 49.0044421906.

The spelling of 117681 in words is "one hundred seventeen thousand, six hundred eighty-one".