168919 has 4 divisors (see below), whose sum is σ = 174400. Its totient is φ = 163440.

The previous prime is 168913. The next prime is 168937. The reversal of 168919 is 919861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919861 = 127 ⋅7243.

It is a cyclic number.

It is not a de Polignac number, because 168919 - 2⁵ = 168887 is a prime.

It is a super-2 number, since 2×168919² = 57067257122, which contains 22 as substring.

It is a Duffinian number.

168919 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2694 + ... + 2755.

It is an arithmetic number, because the mean of its divisors is an integer number (43600).

2¹⁶⁸⁹¹⁹ is an apocalyptic number.

168919 is a deficient number, since it is larger than the sum of its proper divisors (5481).

168919 is an equidigital number, since it uses as much as digits as its factorization.

168919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5480.

The product of its digits is 3888, while the sum is 34.

The square root of 168919 is about 410.9975669028. The cubic root of 168919 is about 55.2789137714.

It can be divided in two parts, 16891 and 9, that added together give a square (16900 = 130²).

The spelling of 168919 in words is "one hundred sixty-eight thousand, nine hundred nineteen".