204351649 has 2 divisors, whose sum is σ = 204351650. Its totient is φ = 204351648.

The previous prime is 204351643. The next prime is 204351673. The reversal of 204351649 is 946153402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 4624 = 14295^2 + 68^2 .

It is a cyclic number.

It is not a de Polignac number, because 204351649 - 2¹¹ = 204349601 is a prime.

It is not a weakly prime, because it can be changed into another prime (204351643) 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, 102175824 + 102175825.

It is an arithmetic number, because the mean of its divisors is an integer number (102175825).

Almost surely, 2^204351649 is an apocalyptic number.

It is an amenable number.

204351649 is a deficient number, since it is larger than the sum of its proper divisors (1).

204351649 is an equidigital number, since it uses as much as digits as its factorization.

204351649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 204351649 is about 14295.1617339574. The cubic root of 204351649 is about 589.0145850920.

The spelling of 204351649 in words is "two hundred four million, three hundred fifty-one thousand, six hundred forty-nine".