205534649 has 2 divisors, whose sum is σ = 205534650. Its totient is φ = 205534648.

The previous prime is 205534591. The next prime is 205534663. The reversal of 205534649 is 946435502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192321424 + 13213225 = 13868^2 + 3635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205534649 is a prime.

It is not a weakly prime, because it can be changed into another prime (205534249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102767324 + 102767325.

It is an arithmetic number, because the mean of its divisors is an integer number (102767325).

Almost surely, 2^205534649 is an apocalyptic number.

It is an amenable number.

205534649 is a deficient number, since it is larger than the sum of its proper divisors (1).

205534649 is an equidigital number, since it uses as much as digits as its factorization.

205534649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 205534649 is about 14336.4796585494. The cubic root of 205534649 is about 590.1490086147.

The spelling of 205534649 in words is "two hundred five million, five hundred thirty-four thousand, six hundred forty-nine".