198127109 has 2 divisors, whose sum is σ = 198127110. Its totient is φ = 198127108.

The previous prime is 198127099. The next prime is 198127121. The reversal of 198127109 is 901721891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105062500 + 93064609 = 10250^2 + 9647^2 .

It is a cyclic number.

It is not a de Polignac number, because 198127109 - 2⁴ = 198127093 is a prime.

It is a super-3 number, since 3×198127109³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198127009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99063554 + 99063555.

It is an arithmetic number, because the mean of its divisors is an integer number (99063555).

Almost surely, 2^198127109 is an apocalyptic number.

It is an amenable number.

198127109 is a deficient number, since it is larger than the sum of its proper divisors (1).

198127109 is an equidigital number, since it uses as much as digits as its factorization.

198127109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 198127109 is about 14075.7631764676. The cubic root of 198127109 is about 582.9723641780.

The spelling of 198127109 in words is "one hundred ninety-eight million, one hundred twenty-seven thousand, one hundred nine".