198901 has 2 divisors, whose sum is σ = 198902.
Its totient is φ = 198900.
The previous prime is 198899. The next prime is 198929. The reversal of 198901 is 109891.
It can be divided in two parts, 19890 and 1, that added together give a palindrome (19891).
198901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an a-pointer prime, because the next prime (198929) can be obtained adding 198901 to its sum of digits (28).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 136900 + 62001 = 370^2 + 249^2
It is an emirp because it is prime and its reverse (109891) is a distict prime.
It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 106861 and 168601.
It is a cyclic number.
It is not a de Polignac number, because 198901 - 21 = 198899 is a prime.
Together with 198899, it forms a pair of twin primes.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 198901.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (198941) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99450 + 99451.
It is an arithmetic number, because the mean of its divisors is an integer number (99451).
2198901 is an apocalyptic number.
It is an amenable number.
198901 is a deficient number, since it is larger than the sum of its proper divisors (1).
198901 is an equidigital number, since it uses as much as digits as its factorization.
198901 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 648, while the sum is 28.
The square root of 198901 is about 445.9831835395.
The cubic root of 198901 is about 58.3730414449.
The spelling of 198901 in words is "one hundred ninety-eight thousand, nine hundred one".