198360881 has 2 divisors, whose sum is σ = 198360882. Its totient is φ = 198360880.

The previous prime is 198360871. The next prime is 198360887. The reversal of 198360881 is 188063891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 13808656 = 13585^2 + 3716^2 .

It is a cyclic number.

It is not a de Polignac number, because 198360881 - 2¹⁰ = 198359857 is a prime.

It is a super-2 number, since 2×198360881² = 78694078222192322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (198360887) 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, 99180440 + 99180441.

It is an arithmetic number, because the mean of its divisors is an integer number (99180441).

Almost surely, 2^198360881 is an apocalyptic number.

It is an amenable number.

198360881 is a deficient number, since it is larger than the sum of its proper divisors (1).

198360881 is an equidigital number, since it uses as much as digits as its factorization.

198360881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 198360881 is about 14084.0647896834. The cubic root of 198360881 is about 583.2015588785.

The spelling of 198360881 in words is "one hundred ninety-eight million, three hundred sixty thousand, eight hundred eighty-one".