198746809 has 2 divisors, whose sum is σ = 198746810. Its totient is φ = 198746808.

The previous prime is 198746791. The next prime is 198746827. The reversal of 198746809 is 908647891.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (198746791) and next prime (198746827).

It can be written as a sum of positive squares in only one way, i.e., 123543225 + 75203584 = 11115^2 + 8672^2 .

It is an emirp because it is prime and its reverse (908647891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198746809 - 2⁵ = 198746777 is a prime.

It is not a weakly prime, because it can be changed into another prime (198746909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99373404 + 99373405.

It is an arithmetic number, because the mean of its divisors is an integer number (99373405).

Almost surely, 2^198746809 is an apocalyptic number.

It is an amenable number.

198746809 is a deficient number, since it is larger than the sum of its proper divisors (1).

198746809 is an equidigital number, since it uses as much as digits as its factorization.

198746809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 198746809 is about 14097.7590063102. The cubic root of 198746809 is about 583.5795366345.

The spelling of 198746809 in words is "one hundred ninety-eight million, seven hundred forty-six thousand, eight hundred nine".