205134247 has 2 divisors, whose sum is σ = 205134248. Its totient is φ = 205134246.

The previous prime is 205134233. The next prime is 205134287. The reversal of 205134247 is 742431502.

205134247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205134247 - 2⁷ = 205134119 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205134227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102567123 + 102567124.

It is an arithmetic number, because the mean of its divisors is an integer number (102567124).

Almost surely, 2^205134247 is an apocalyptic number.

205134247 is a deficient number, since it is larger than the sum of its proper divisors (1).

205134247 is an equidigital number, since it uses as much as digits as its factorization.

205134247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 205134247 is about 14322.5084046057. The cubic root of 205134247 is about 589.7655364458.

Adding to 205134247 its reverse (742431502), we get a palindrome (947565749).

The spelling of 205134247 in words is "two hundred five million, one hundred thirty-four thousand, two hundred forty-seven".