198567221 has 2 divisors, whose sum is σ = 198567222. Its totient is φ = 198567220.

The previous prime is 198567209. The next prime is 198567301. The reversal of 198567221 is 122765891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110019121 + 88548100 = 10489^2 + 9410^2 .

It is a cyclic number.

It is not a de Polignac number, because 198567221 - 2²⁶ = 131458357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198567821) 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, 99283610 + 99283611.

It is an arithmetic number, because the mean of its divisors is an integer number (99283611).

Almost surely, 2^198567221 is an apocalyptic number.

It is an amenable number.

198567221 is a deficient number, since it is larger than the sum of its proper divisors (1).

198567221 is an equidigital number, since it uses as much as digits as its factorization.

198567221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 198567221 is about 14091.3881856970. The cubic root of 198567221 is about 583.4037091328.

The spelling of 198567221 in words is "one hundred ninety-eight million, five hundred sixty-seven thousand, two hundred twenty-one".