198861227 has 2 divisors, whose sum is σ = 198861228. Its totient is φ = 198861226.

The previous prime is 198861139. The next prime is 198861233. The reversal of 198861227 is 722168891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198861227 - 2²⁰ = 197812651 is a prime.

It is not a weakly prime, because it can be changed into another prime (198861287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99430613 + 99430614.

It is an arithmetic number, because the mean of its divisors is an integer number (99430614).

Almost surely, 2^198861227 is an apocalyptic number.

198861227 is a deficient number, since it is larger than the sum of its proper divisors (1).

198861227 is an equidigital number, since it uses as much as digits as its factorization.

198861227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 198861227 is about 14101.8164432813. The cubic root of 198861227 is about 583.6915035374.

The spelling of 198861227 in words is "one hundred ninety-eight million, eight hundred sixty-one thousand, two hundred twenty-seven".