198641 has 2 divisors, whose sum is σ = 198642. Its totient is φ = 198640.

The previous prime is 198637. The next prime is 198647. The reversal of 198641 is 146891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 5041 = 440^2 + 71^2 .

It is an emirp because it is prime and its reverse (146891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198641 - 2² = 198637 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₁₇₈₇₆ and since 198641 and 17876 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (198647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99320 + 99321.

It is an arithmetic number, because the mean of its divisors is an integer number (99321).

2¹⁹⁸⁶⁴¹ is an apocalyptic number.

It is an amenable number.

198641 is a deficient number, since it is larger than the sum of its proper divisors (1).

198641 is an equidigital number, since it uses as much as digits as its factorization.

198641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 198641 is about 445.6915974079. The cubic root of 198641 is about 58.3475956056.

The spelling of 198641 in words is "one hundred ninety-eight thousand, six hundred forty-one".