204346490209 has 9 divisors (see below), whose sum is σ = 217082117011. Its totient is φ = 192318875680.

The previous prime is 204346490191. The next prime is 204346490239. The reversal of 204346490209 is 902094643402.

It is a happy number.

The square root of 204346490209 is 452047.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 159093288225 + 45253201984 = 398865^2 + 212728^2 .

It is not a de Polignac number, because 204346490209 - 2³¹ = 202199006561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204346490239) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7671504 + ... + 7698094.

Almost surely, 2^204346490209 is an apocalyptic number.

204346490209 is the 452047-th square number.

204346490209 is the 226024-th centered octagonal number.

It is an amenable number.

204346490209 is a deficient number, since it is larger than the sum of its proper divisors (12735626802).

204346490209 is an frugal number, since it uses more digits than its factorization.

204346490209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53216 (or 26608 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The spelling of 204346490209 in words is "two hundred four billion, three hundred forty-six million, four hundred ninety thousand, two hundred nine".