204489149 has 2 divisors, whose sum is σ = 204489150. Its totient is φ = 204489148.

The previous prime is 204489137. The next prime is 204489157. The reversal of 204489149 is 941984402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171426649 + 33062500 = 13093^2 + 5750^2 .

It is a cyclic number.

It is not a de Polignac number, because 204489149 - 2¹² = 204485053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204489119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102244574 + 102244575.

It is an arithmetic number, because the mean of its divisors is an integer number (102244575).

Almost surely, 2^204489149 is an apocalyptic number.

It is an amenable number.

204489149 is a deficient number, since it is larger than the sum of its proper divisors (1).

204489149 is an equidigital number, since it uses as much as digits as its factorization.

204489149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 204489149 is about 14299.9702447243. The cubic root of 204489149 is about 589.1466635424.

The spelling of 204489149 in words is "two hundred four million, four hundred eighty-nine thousand, one hundred forty-nine".