198245609 has 4 divisors (see below), whose sum is σ = 202856016. Its totient is φ = 193635204.

The previous prime is 198245587. The next prime is 198245633. The reversal of 198245609 is 906542891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198245609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198245609.

It is not an unprimeable number, because it can be changed into a prime (198245659) 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 in 3 ways as a sum of consecutive naturals, for example, 2305139 + ... + 2305224.

It is an arithmetic number, because the mean of its divisors is an integer number (50714004).

Almost surely, 2^198245609 is an apocalyptic number.

It is an amenable number.

198245609 is a deficient number, since it is larger than the sum of its proper divisors (4610407).

198245609 is an equidigital number, since it uses as much as digits as its factorization.

198245609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610406.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 198245609 is about 14079.9719104833. The cubic root of 198245609 is about 583.0885664439.

The spelling of 198245609 in words is "one hundred ninety-eight million, two hundred forty-five thousand, six hundred nine".