204612389 has 2 divisors, whose sum is σ = 204612390. Its totient is φ = 204612388.

The previous prime is 204612341. The next prime is 204612407. The reversal of 204612389 is 983216402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153016900 + 51595489 = 12370^2 + 7183^2 .

It is a cyclic number.

It is not a de Polignac number, because 204612389 - 2¹² = 204608293 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204612319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102306194 + 102306195.

It is an arithmetic number, because the mean of its divisors is an integer number (102306195).

Almost surely, 2^204612389 is an apocalyptic number.

It is an amenable number.

204612389 is a deficient number, since it is larger than the sum of its proper divisors (1).

204612389 is an equidigital number, since it uses as much as digits as its factorization.

204612389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 204612389 is about 14304.2786955512. The cubic root of 204612389 is about 589.2649939511.

The spelling of 204612389 in words is "two hundred four million, six hundred twelve thousand, three hundred eighty-nine".