198936281 has 2 divisors, whose sum is σ = 198936282. Its totient is φ = 198936280.

The previous prime is 198936253. The next prime is 198936301. The reversal of 198936281 is 182639891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192071881 + 6864400 = 13859^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 198936281 - 2¹⁸ = 198674137 is a prime.

It is a super-2 number, since 2×198936281² = 79151287796221922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (198936211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99468140 + 99468141.

It is an arithmetic number, because the mean of its divisors is an integer number (99468141).

Almost surely, 2^198936281 is an apocalyptic number.

It is an amenable number.

198936281 is a deficient number, since it is larger than the sum of its proper divisors (1).

198936281 is an equidigital number, since it uses as much as digits as its factorization.

198936281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 47.

The square root of 198936281 is about 14104.4773387744. The cubic root of 198936281 is about 583.7649263837.

The spelling of 198936281 in words is "one hundred ninety-eight million, nine hundred thirty-six thousand, two hundred eighty-one".