171681 has 8 divisors (see below), whose sum is σ = 231840. Its totient is φ = 112992.

The previous prime is 171679. The next prime is 171697. The reversal of 171681 is 186171.

171681 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 not a de Polignac number, because 171681 - 2¹ = 171679 is a prime.

It is a super-2 number, since 2×171681² = 58948731522, 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 171681.

It is not an unprimeable number, because it can be changed into a prime (171641) 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, 55 + ... + 588.

It is an arithmetic number, because the mean of its divisors is an integer number (28980).

2¹⁷¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

171681 is a deficient number, since it is larger than the sum of its proper divisors (60159).

171681 is an equidigital number, since it uses as much as digits as its factorization.

171681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735.

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

The square root of 171681 is about 414.3440599309. The cubic root of 171681 is about 55.5785754972.

The spelling of 171681 in words is "one hundred seventy-one thousand, six hundred eighty-one".