1223635613 has 2 divisors, whose sum is σ = 1223635614. Its totient is φ = 1223635612.

The previous prime is 1223635603. The next prime is 1223635681. The reversal of 1223635613 is 3165363221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1068832249 + 154803364 = 32693^2 + 12442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223635613 - 2¹² = 1223631517 is a prime.

It is a super-2 number, since 2×1223635613² = 2994568226803771538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1223635613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223635603) by changing a digit.

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 as a sum of consecutive naturals, namely, 611817806 + 611817807.

It is an arithmetic number, because the mean of its divisors is an integer number (611817807).

Almost surely, 2^1223635613 is an apocalyptic number.

It is an amenable number.

1223635613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223635613 is an equidigital number, since it uses as much as digits as its factorization.

1223635613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

The square root of 1223635613 is about 34980.5033268534. The cubic root of 1223635613 is about 1069.5900875472.

Adding to 1223635613 its reverse (3165363221), we get a palindrome (4388998834).

The spelling of 1223635613 in words is "one billion, two hundred twenty-three million, six hundred thirty-five thousand, six hundred thirteen".