205342447 has 2 divisors, whose sum is σ = 205342448. Its totient is φ = 205342446.

The previous prime is 205342441. The next prime is 205342451. The reversal of 205342447 is 744243502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205342447 - 2²³ = 196953839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205342441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102671223 + 102671224.

It is an arithmetic number, because the mean of its divisors is an integer number (102671224).

Almost surely, 2^205342447 is an apocalyptic number.

205342447 is a deficient number, since it is larger than the sum of its proper divisors (1).

205342447 is an equidigital number, since it uses as much as digits as its factorization.

205342447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 31.

The square root of 205342447 is about 14329.7748412178. The cubic root of 205342447 is about 589.9649955293.

Adding to 205342447 its reverse (744243502), we get a palindrome (949585949).

The spelling of 205342447 in words is "two hundred five million, three hundred forty-two thousand, four hundred forty-seven".