198957609 has 6 divisors (see below), whose sum is σ = 287383226. Its totient is φ = 132638400.

The previous prime is 198957599. The next prime is 198957643. The reversal of 198957609 is 906759891.

It can be written as a sum of positive squares in only one way, i.e., 160579584 + 38378025 = 12672^2 + 6195^2 .

It is not a de Polignac number, because 198957609 - 2⁴ = 198957593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198957509) 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 5 ways as a sum of consecutive naturals, for example, 11053192 + ... + 11053209.

Almost surely, 2^198957609 is an apocalyptic number.

It is an amenable number.

198957609 is a deficient number, since it is larger than the sum of its proper divisors (88425617).

198957609 is a wasteful number, since it uses less digits than its factorization.

198957609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22106407 (or 22106404 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 198957609 is about 14105.2333904831. The cubic root of 198957609 is about 583.7857874912.

The spelling of 198957609 in words is "one hundred ninety-eight million, nine hundred fifty-seven thousand, six hundred nine".