204994509 has 4 divisors (see below), whose sum is σ = 273326016. Its totient is φ = 136663004.

The previous prime is 204994507. The next prime is 204994511. The reversal of 204994509 is 905499402.

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 an interprime number because it is at equal distance from previous prime (204994507) and next prime (204994511).

It is a cyclic number.

It is not a de Polignac number, because 204994509 - 2¹ = 204994507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204994507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34165749 + ... + 34165754.

It is an arithmetic number, because the mean of its divisors is an integer number (68331504).

Almost surely, 2^204994509 is an apocalyptic number.

It is an amenable number.

204994509 is a deficient number, since it is larger than the sum of its proper divisors (68331507).

204994509 is an equidigital number, since it uses as much as digits as its factorization.

204994509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68331506.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 204994509 is about 14317.6293079546. The cubic root of 204994509 is about 589.6315894037.

The spelling of 204994509 in words is "two hundred four million, nine hundred ninety-four thousand, five hundred nine".