205132649 has 2 divisors, whose sum is σ = 205132650. Its totient is φ = 205132648.

The previous prime is 205132633. The next prime is 205132667. The reversal of 205132649 is 946231502.

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., 144961600 + 60171049 = 12040^2 + 7757^2 .

It is a cyclic number.

It is not a de Polignac number, because 205132649 - 2⁴ = 205132633 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (205132619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102566324 + 102566325.

It is an arithmetic number, because the mean of its divisors is an integer number (102566325).

Almost surely, 2^205132649 is an apocalyptic number.

It is an amenable number.

205132649 is a deficient number, since it is larger than the sum of its proper divisors (1).

205132649 is an equidigital number, since it uses as much as digits as its factorization.

205132649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 205132649 is about 14322.4526181796. The cubic root of 205132649 is about 589.7640050133.

The spelling of 205132649 in words is "two hundred five million, one hundred thirty-two thousand, six hundred forty-nine".