167681 has 4 divisors (see below), whose sum is σ = 170052. Its totient is φ = 165312.

The previous prime is 167677. The next prime is 167683. The reversal of 167681 is 186761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87025 + 80656 = 295^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 167681 - 2² = 167677 is a prime.

It is a super-2 number, since 2×167681² = 56233835522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 167681.

It is not an unprimeable number, because it can be changed into a prime (167683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076 + ... + 1221.

It is an arithmetic number, because the mean of its divisors is an integer number (42513).

2¹⁶⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

167681 is a deficient number, since it is larger than the sum of its proper divisors (2371).

167681 is an equidigital number, since it uses as much as digits as its factorization.

167681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370.

The product of its digits is 2016, while the sum is 29.

The square root of 167681 is about 409.4887055830. The cubic root of 167681 is about 55.1435369226.

It can be divided in two parts, 167 and 681, that added together give a palindrome (848).

The spelling of 167681 in words is "one hundred sixty-seven thousand, six hundred eighty-one".