168681 has 8 divisors (see below), whose sum is σ = 228960. Its totient is φ = 110432.

The previous prime is 168677. The next prime is 168697. The reversal of 168681 is 186861.

168681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 168681 - 2² = 168677 is a prime.

It is a super-2 number, since 2×168681² = 56906559522, which contains 22 as substring.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 168681.

It is not an unprimeable number, because it can be changed into a prime (168601) 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, 300 + ... + 653.

It is an arithmetic number, because the mean of its divisors is an integer number (28620).

2¹⁶⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

168681 is a deficient number, since it is larger than the sum of its proper divisors (60279).

168681 is an equidigital number, since it uses as much as digits as its factorization.

168681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015.

The product of its digits is 2304, while the sum is 30.

The square root of 168681 is about 410.7079254166. The cubic root of 168681 is about 55.2529396551.

The spelling of 168681 in words is "one hundred sixty-eight thousand, six hundred eighty-one".