205224245 has 4 divisors (see below), whose sum is σ = 246269100. Its totient is φ = 164179392.

The previous prime is 205224233. The next prime is 205224259. The reversal of 205224245 is 542422502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 136632721 + 68591524 = 11689^2 + 8282^2 .

It is a cyclic number.

It is not a de Polignac number, because 205224245 - 2¹² = 205220149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20522420 + ... + 20522429.

It is an arithmetic number, because the mean of its divisors is an integer number (61567275).

Almost surely, 2^205224245 is an apocalyptic number.

It is an amenable number.

205224245 is a deficient number, since it is larger than the sum of its proper divisors (41044855).

205224245 is an equidigital number, since it uses as much as digits as its factorization.

205224245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41044854.

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

The square root of 205224245 is about 14325.6498979976. The cubic root of 205224245 is about 589.8517725883.

Adding to 205224245 its reverse (542422502), we get a palindrome (747646747).

The spelling of 205224245 in words is "two hundred five million, two hundred twenty-four thousand, two hundred forty-five".