205147849 has 2 divisors, whose sum is σ = 205147850. Its totient is φ = 205147848.

The previous prime is 205147793. The next prime is 205147861. The reversal of 205147849 is 948741502.

205147849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199233225 + 5914624 = 14115^2 + 2432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205147849 is a prime.

It is not a weakly prime, because it can be changed into another prime (205147889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102573924 + 102573925.

It is an arithmetic number, because the mean of its divisors is an integer number (102573925).

Almost surely, 2^205147849 is an apocalyptic number.

It is an amenable number.

205147849 is a deficient number, since it is larger than the sum of its proper divisors (1).

205147849 is an equidigital number, since it uses as much as digits as its factorization.

205147849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 205147849 is about 14322.9832437241. The cubic root of 205147849 is about 589.7785715089.

The spelling of 205147849 in words is "two hundred five million, one hundred forty-seven thousand, eight hundred forty-nine".