205053649 has 2 divisors, whose sum is σ = 205053650. Its totient is φ = 205053648.

The previous prime is 205053647. The next prime is 205053659. The reversal of 205053649 is 946350502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170772624 + 34281025 = 13068^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 205053649 - 2¹ = 205053647 is a prime.

Together with 205053647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (205053647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102526824 + 102526825.

It is an arithmetic number, because the mean of its divisors is an integer number (102526825).

Almost surely, 2^205053649 is an apocalyptic number.

It is an amenable number.

205053649 is a deficient number, since it is larger than the sum of its proper divisors (1).

205053649 is an equidigital number, since it uses as much as digits as its factorization.

205053649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 205053649 is about 14319.6944450641. The cubic root of 205053649 is about 589.6882859783.

The spelling of 205053649 in words is "two hundred five million, fifty-three thousand, six hundred forty-nine".