1222605565 has 4 divisors (see below), whose sum is σ = 1467126684. Its totient is φ = 978084448.

The previous prime is 1222605551. The next prime is 1222605569. The reversal of 1222605565 is 5655062221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5655062221 = 317 ⋅17839313.

It can be written as a sum of positive squares in 2 ways, for example, as 680740281 + 541865284 = 26091^2 + 23278^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222605565 - 2⁷ = 1222605437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222605565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222605569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122260552 + ... + 122260561.

It is an arithmetic number, because the mean of its divisors is an integer number (366781671).

Almost surely, 2^1222605565 is an apocalyptic number.

It is an amenable number.

1222605565 is a deficient number, since it is larger than the sum of its proper divisors (244521119).

1222605565 is an equidigital number, since it uses as much as digits as its factorization.

1222605565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244521118.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 1222605565 is about 34965.7770541425. Note that the first 3 decimals coincide. The cubic root of 1222605565 is about 1069.2898787797.

Adding to 1222605565 its reverse (5655062221), we get a palindrome (6877667786).

The spelling of 1222605565 in words is "one billion, two hundred twenty-two million, six hundred five thousand, five hundred sixty-five".