205242245 has 8 divisors (see below), whose sum is σ = 265236216. Its totient is φ = 151563456.

The previous prime is 205242217. The next prime is 205242253. The reversal of 205242245 is 542242502.

It can be written as a sum of positive squares in 4 ways, for example, as 351649 + 204890596 = 593^2 + 14314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205242245 - 2⁸ = 205241989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1578722 + ... + 1578851.

It is an arithmetic number, because the mean of its divisors is an integer number (33154527).

Almost surely, 2^205242245 is an apocalyptic number.

It is an amenable number.

205242245 is a deficient number, since it is larger than the sum of its proper divisors (59993971).

205242245 is a wasteful number, since it uses less digits than its factorization.

205242245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157591.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 205242245 is about 14326.2781279717. The cubic root of 205242245 is about 589.8690171744.

Adding to 205242245 its reverse (542242502), we get a palindrome (747484747).

The spelling of 205242245 in words is "two hundred five million, two hundred forty-two thousand, two hundred forty-five".