198851 has 2 divisors, whose sum is σ = 198852. Its totient is φ = 198850.

The previous prime is 198841. The next prime is 198859. The reversal of 198851 is 158891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198851 - 2¹⁴ = 182467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198859) 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 as a sum of consecutive naturals, namely, 99425 + 99426.

It is an arithmetic number, because the mean of its divisors is an integer number (99426).

2¹⁹⁸⁸⁵¹ is an apocalyptic number.

198851 is a deficient number, since it is larger than the sum of its proper divisors (1).

198851 is an equidigital number, since it uses as much as digits as its factorization.

198851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 32.

The square root of 198851 is about 445.9271240909. The cubic root of 198851 is about 58.3681497371.

The spelling of 198851 in words is "one hundred ninety-eight thousand, eight hundred fifty-one".