168091 has 16 divisors (see below), whose sum is σ = 218880. Its totient is φ = 125280.

The previous prime is 168089. The next prime is 168109. The reversal of 168091 is 190861.

168091 = 103² + 104² + ... + 116².

It is a cyclic number.

It is not a de Polignac number, because 168091 - 2¹ = 168089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2820 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (13680).

2¹⁶⁸⁰⁹¹ is an apocalyptic number.

168091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

168091 is a deficient number, since it is larger than the sum of its proper divisors (50789).

168091 is a wasteful number, since it uses less digits than its factorization.

168091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 168091 is about 409.9890242433. The cubic root of 168091 is about 55.1884445111.

It can be divided in two parts, 1680 and 91, that added together give a palindrome (1771).

The spelling of 168091 in words is "one hundred sixty-eight thousand, ninety-one".