1213615243 has 2 divisors, whose sum is σ = 1213615244. Its totient is φ = 1213615242.

The previous prime is 1213615223. The next prime is 1213615259. The reversal of 1213615243 is 3425163121.

It is a strong prime.

It is an emirp because it is prime and its reverse (3425163121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213615243 - 2²⁹ = 676744331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213615213) 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 as a sum of consecutive naturals, namely, 606807621 + 606807622.

It is an arithmetic number, because the mean of its divisors is an integer number (606807622).

Almost surely, 2^1213615243 is an apocalyptic number.

1213615243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213615243 is an equidigital number, since it uses as much as digits as its factorization.

1213615243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 28.

The square root of 1213615243 is about 34836.9809685053. The cubic root of 1213615243 is about 1066.6624518171.

Adding to 1213615243 its reverse (3425163121), we get a palindrome (4638778364).

The spelling of 1213615243 in words is "one billion, two hundred thirteen million, six hundred fifteen thousand, two hundred forty-three".