198891227 has 2 divisors, whose sum is σ = 198891228. Its totient is φ = 198891226.

The previous prime is 198891197. The next prime is 198891283. The reversal of 198891227 is 722198891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198891227 - 2⁶ = 198891163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198891127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99445613 + 99445614.

It is an arithmetic number, because the mean of its divisors is an integer number (99445614).

Almost surely, 2^198891227 is an apocalyptic number.

198891227 is a deficient number, since it is larger than the sum of its proper divisors (1).

198891227 is an equidigital number, since it uses as much as digits as its factorization.

198891227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 47.

The square root of 198891227 is about 14102.8800959237. The cubic root of 198891227 is about 583.7208537614.

The spelling of 198891227 in words is "one hundred ninety-eight million, eight hundred ninety-one thousand, two hundred twenty-seven".