205442287 has 2 divisors, whose sum is σ = 205442288. Its totient is φ = 205442286.

The previous prime is 205442213. The next prime is 205442299. The reversal of 205442287 is 782244502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205442287 - 2¹¹ = 205440239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205442087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102721143 + 102721144.

It is an arithmetic number, because the mean of its divisors is an integer number (102721144).

Almost surely, 2^205442287 is an apocalyptic number.

205442287 is a deficient number, since it is larger than the sum of its proper divisors (1).

205442287 is an equidigital number, since it uses as much as digits as its factorization.

205442287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 205442287 is about 14333.2580734458. The cubic root of 205442287 is about 590.0605960936.

Adding to 205442287 its reverse (782244502), we get a palindrome (987686789).

The spelling of 205442287 in words is "two hundred five million, four hundred forty-two thousand, two hundred eighty-seven".