198197801 has 2 divisors, whose sum is σ = 198197802. Its totient is φ = 198197800.

The previous prime is 198197711. The next prime is 198197821. The reversal of 198197801 is 108791891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196672576 + 1525225 = 14024^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 198197801 - 2¹⁸ = 197935657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198197821) 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 as a sum of consecutive naturals, namely, 99098900 + 99098901.

It is an arithmetic number, because the mean of its divisors is an integer number (99098901).

Almost surely, 2^198197801 is an apocalyptic number.

It is an amenable number.

198197801 is a deficient number, since it is larger than the sum of its proper divisors (1).

198197801 is an equidigital number, since it uses as much as digits as its factorization.

198197801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 44.

The square root of 198197801 is about 14078.2740774571. The cubic root of 198197801 is about 583.0416910226.

The spelling of 198197801 in words is "one hundred ninety-eight million, one hundred ninety-seven thousand, eight hundred one".