168997 has 4 divisors (see below), whose sum is σ = 178956. Its totient is φ = 159040.

The previous prime is 168991. The next prime is 169003. The reversal of 168997 is 799861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799861 = 73 ⋅10957.

It is an interprime number because it is at equal distance from previous prime (168991) and next prime (169003).

It can be written as a sum of positive squares in 2 ways, for example, as 45796 + 123201 = 214^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 168997 - 2⁷ = 168869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168991) 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, 4954 + ... + 4987.

It is an arithmetic number, because the mean of its divisors is an integer number (44739).

2¹⁶⁸⁹⁹⁷ is an apocalyptic number.

168997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

168997 is a deficient number, since it is larger than the sum of its proper divisors (9959).

168997 is an equidigital number, since it uses as much as digits as its factorization.

168997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9958.

The product of its digits is 27216, while the sum is 40.

The square root of 168997 is about 411.0924470238. The cubic root of 168997 is about 55.2874209884.

The spelling of 168997 in words is "one hundred sixty-eight thousand, nine hundred ninety-seven".