1222513636 has 6 divisors (see below), whose sum is σ = 2139398870. Its totient is φ = 611256816.

The previous prime is 1222513631. The next prime is 1222513651. The reversal of 1222513636 is 6363152221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1165812736 + 56700900 = 34144^2 + 7530^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1222513598 and 1222513607.

It is not an unprimeable number, because it can be changed into a prime (1222513631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152814201 + ... + 152814208.

Almost surely, 2^1222513636 is an apocalyptic number.

It is an amenable number.

1222513636 is a deficient number, since it is larger than the sum of its proper divisors (916885234).

1222513636 is a wasteful number, since it uses less digits than its factorization.

1222513636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305628413 (or 305628411 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 1222513636 is about 34964.4624726307. The cubic root of 1222513636 is about 1069.2630777639.

Adding to 1222513636 its reverse (6363152221), we get a palindrome (7585665857).

The spelling of 1222513636 in words is "one billion, two hundred twenty-two million, five hundred thirteen thousand, six hundred thirty-six".