199998049 has 2 divisors, whose sum is σ = 199998050. Its totient is φ = 199998048.

The previous prime is 199997999. The next prime is 199998067. The reversal of 199998049 is 940899991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110355025 + 89643024 = 10505^2 + 9468^2 .

It is a cyclic number.

It is not a de Polignac number, because 199998049 - 2¹³ = 199989857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199997984 and 199998002.

It is not a weakly prime, because it can be changed into another prime (199998089) 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, 99999024 + 99999025.

It is an arithmetic number, because the mean of its divisors is an integer number (99999025).

Almost surely, 2^199998049 is an apocalyptic number.

It is an amenable number.

199998049 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998049 is an equidigital number, since it uses as much as digits as its factorization.

199998049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The square root of 199998049 is about 14142.0666452962. The cubic root of 199998049 is about 584.8016460502.

The spelling of 199998049 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, forty-nine".