198661447 has 4 divisors (see below), whose sum is σ = 198867856. Its totient is φ = 198455040.

The previous prime is 198661429. The next prime is 198661451. The reversal of 198661447 is 744166891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198661447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198661397 and 198661406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198661417) 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, 101754 + ... + 103687.

It is an arithmetic number, because the mean of its divisors is an integer number (49716964).

Almost surely, 2^198661447 is an apocalyptic number.

198661447 is a deficient number, since it is larger than the sum of its proper divisors (206409).

198661447 is an equidigital number, since it uses as much as digits as its factorization.

198661447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206408.

The product of its digits is 290304, while the sum is 46.

The square root of 198661447 is about 14094.7311787065. The cubic root of 198661447 is about 583.4959752928.

The spelling of 198661447 in words is "one hundred ninety-eight million, six hundred sixty-one thousand, four hundred forty-seven".