205222417 has 4 divisors (see below), whose sum is σ = 205463860. Its totient is φ = 204980976.

The previous prime is 205222411. The next prime is 205222427. The reversal of 205222417 is 714222502.

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 64657681 + 140564736 = 8041^2 + 11856^2 .

It is a cyclic number.

It is not a de Polignac number, because 205222417 - 2⁷ = 205222289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205222391 and 205222400.

It is not an unprimeable number, because it can be changed into a prime (205222411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119442 + ... + 121147.

It is an arithmetic number, because the mean of its divisors is an integer number (51365965).

Almost surely, 2^205222417 is an apocalyptic number.

It is an amenable number.

205222417 is a deficient number, since it is larger than the sum of its proper divisors (241443).

205222417 is an equidigital number, since it uses as much as digits as its factorization.

205222417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241442.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 205222417 is about 14325.5860962126. The cubic root of 205222417 is about 589.8500212484.

Adding to 205222417 its reverse (714222502), we get a palindrome (919444919).

The spelling of 205222417 in words is "two hundred five million, two hundred twenty-two thousand, four hundred seventeen".