168161 has 4 divisors (see below), whose sum is σ = 192192. Its totient is φ = 144132.

The previous prime is 168151. The next prime is 168193. The reversal of 168161 is 161861.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-168161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168151) 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, 12005 + ... + 12018.

It is an arithmetic number, because the mean of its divisors is an integer number (48048).

2¹⁶⁸¹⁶¹ is an apocalyptic number.

It is an amenable number.

168161 is a deficient number, since it is larger than the sum of its proper divisors (24031).

168161 is an equidigital number, since it uses as much as digits as its factorization.

168161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24030.

The product of its digits is 288, while the sum is 23.

The square root of 168161 is about 410.0743834965. The cubic root of 168161 is about 55.1961043600.

The spelling of 168161 in words is "one hundred sixty-eight thousand, one hundred sixty-one".