198036561 has 16 divisors (see below), whose sum is σ = 270522368. Its totient is φ = 128822400.

The previous prime is 198036547. The next prime is 198036569. The reversal of 198036561 is 165630891.

It is not a de Polignac number, because 198036561 - 2⁵ = 198036529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198036569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18981 + ... + 27501.

It is an arithmetic number, because the mean of its divisors is an integer number (16907648).

Almost surely, 2^198036561 is an apocalyptic number.

It is an amenable number.

198036561 is a deficient number, since it is larger than the sum of its proper divisors (72485807).

198036561 is a wasteful number, since it uses less digits than its factorization.

198036561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 198036561 is about 14072.5463580690. The cubic root of 198036561 is about 582.8835406856.

The spelling of 198036561 in words is "one hundred ninety-eight million, thirty-six thousand, five hundred sixty-one".