198001 has 4 divisors (see below), whose sum is σ = 198900. Its totient is φ = 197104.

The previous prime is 197971. The next prime is 198013. The reversal of 198001 is 100891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 104976 + 93025 = 324^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 198001 - 2⁵ = 197969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198001.

It is not an unprimeable number, because it can be changed into a prime (198031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135 + ... + 643.

It is an arithmetic number, because the mean of its divisors is an integer number (49725).

2¹⁹⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

198001 is a deficient number, since it is larger than the sum of its proper divisors (899).

198001 is an equidigital number, since it uses as much as digits as its factorization.

198001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 198001 is about 444.9730328908. The cubic root of 198001 is about 58.2848649549.

Adding to 198001 its reverse (100891), we get a palindrome (298892).

The spelling of 198001 in words is "one hundred ninety-eight thousand, one".