199125209 has 2 divisors, whose sum is σ = 199125210. Its totient is φ = 199125208.

The previous prime is 199125197. The next prime is 199125247. The reversal of 199125209 is 902521991.

It is an a-pointer prime, because the next prime (199125247) can be obtained adding 199125209 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197486809 + 1638400 = 14053^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 199125209 - 2⁴ = 199125193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (199125259) 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, 99562604 + 99562605.

It is an arithmetic number, because the mean of its divisors is an integer number (99562605).

Almost surely, 2^199125209 is an apocalyptic number.

It is an amenable number.

199125209 is a deficient number, since it is larger than the sum of its proper divisors (1).

199125209 is an equidigital number, since it uses as much as digits as its factorization.

199125209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 199125209 is about 14111.1731971513. The cubic root of 199125209 is about 583.9496666838.

The spelling of 199125209 in words is "one hundred ninety-nine million, one hundred twenty-five thousand, two hundred nine".