198281 has 2 divisors, whose sum is σ = 198282. Its totient is φ = 198280.

The previous prime is 198277. The next prime is 198301. The reversal of 198281 is 182891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198025 + 256 = 445^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 198281 - 2² = 198277 is a prime.

It is a super-2 number, since 2×198281² = 78630709922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198281.

It is not a weakly prime, because it can be changed into another prime (198221) 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, 99140 + 99141.

It is an arithmetic number, because the mean of its divisors is an integer number (99141).

2¹⁹⁸²⁸¹ is an apocalyptic number.

It is an amenable number.

198281 is a deficient number, since it is larger than the sum of its proper divisors (1).

198281 is an equidigital number, since it uses as much as digits as its factorization.

198281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 198281 is about 445.2875475465. The cubic root of 198281 is about 58.3123262226.

The spelling of 198281 in words is "one hundred ninety-eight thousand, two hundred eighty-one".