198461209 has 2 divisors, whose sum is σ = 198461210. Its totient is φ = 198461208.

The previous prime is 198461177. The next prime is 198461261. The reversal of 198461209 is 902164891.

198461209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198387225 + 73984 = 14085^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 198461209 - 2⁵ = 198461177 is a prime.

It is not a weakly prime, because it can be changed into another prime (198461299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99230604 + 99230605.

It is an arithmetic number, because the mean of its divisors is an integer number (99230605).

Almost surely, 2^198461209 is an apocalyptic number.

It is an amenable number.

198461209 is a deficient number, since it is larger than the sum of its proper divisors (1).

198461209 is an equidigital number, since it uses as much as digits as its factorization.

198461209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 198461209 is about 14087.6260952653. The cubic root of 198461209 is about 583.2998672139.

The spelling of 198461209 in words is "one hundred ninety-eight million, four hundred sixty-one thousand, two hundred nine".