198169 has 4 divisors (see below), whose sum is σ = 209844. Its totient is φ = 186496.

The previous prime is 198139. The next prime is 198173. The reversal of 198169 is 961891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 961891 = 7 ⋅137413.

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 48400 = 387^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 198169 - 2¹³ = 189977 is a prime.

It is a super-2 number, since 2×198169² = 78541905122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

198169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (198109) 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, 5812 + ... + 5845.

It is an arithmetic number, because the mean of its divisors is an integer number (52461).

2¹⁹⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

198169 is a deficient number, since it is larger than the sum of its proper divisors (11675).

198169 is a wasteful number, since it uses less digits than its factorization.

198169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11674.

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

The square root of 198169 is about 445.1617683494. The cubic root of 198169 is about 58.3013448198.

Subtracting from 198169 its sum of digits (34), we obtain a triangular number (198135 = T₆₂₉).

The spelling of 198169 in words is "one hundred ninety-eight thousand, one hundred sixty-nine".