204210649 has 2 divisors, whose sum is σ = 204210650. Its totient is φ = 204210648.

The previous prime is 204210641. The next prime is 204210661. The reversal of 204210649 is 946012402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114340249 + 89870400 = 10693^2 + 9480^2 .

It is a cyclic number.

It is not a de Polignac number, because 204210649 - 2³ = 204210641 is a prime.

It is not a weakly prime, because it can be changed into another prime (204210641) 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, 102105324 + 102105325.

It is an arithmetic number, because the mean of its divisors is an integer number (102105325).

Almost surely, 2^204210649 is an apocalyptic number.

It is an amenable number.

204210649 is a deficient number, since it is larger than the sum of its proper divisors (1).

204210649 is an equidigital number, since it uses as much as digits as its factorization.

204210649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 204210649 is about 14290.2291444189. The cubic root of 204210649 is about 588.8790831022.

The spelling of 204210649 in words is "two hundred four million, two hundred ten thousand, six hundred forty-nine".