205199609 has 8 divisors (see below), whose sum is σ = 206448000. Its totient is φ = 203955696.

The previous prime is 205199597. The next prime is 205199611. The reversal of 205199609 is 906991502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205199609 - 2²⁴ = 188422393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205199689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136142 + ... + 137640.

It is an arithmetic number, because the mean of its divisors is an integer number (25806000).

Almost surely, 2^205199609 is an apocalyptic number.

It is an amenable number.

205199609 is a deficient number, since it is larger than the sum of its proper divisors (1248391).

205199609 is a wasteful number, since it uses less digits than its factorization.

205199609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239.

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 205199609 is about 14324.7900159130. The cubic root of 205199609 is about 589.8281688635.

The spelling of 205199609 in words is "two hundred five million, one hundred ninety-nine thousand, six hundred nine".