1213435913 has 2 divisors, whose sum is σ = 1213435914. Its totient is φ = 1213435912.

The previous prime is 1213435903. The next prime is 1213435921. The reversal of 1213435913 is 3195343121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787756489 + 425679424 = 28067^2 + 20632^2 .

It is an emirp because it is prime and its reverse (3195343121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213435913 - 2³⁰ = 139694089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213435913.

It is not a weakly prime, because it can be changed into another prime (1213435903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606717956 + 606717957.

It is an arithmetic number, because the mean of its divisors is an integer number (606717957).

Almost surely, 2^1213435913 is an apocalyptic number.

It is an amenable number.

1213435913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213435913 is an equidigital number, since it uses as much as digits as its factorization.

1213435913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 1213435913 is about 34834.4070281094. The cubic root of 1213435913 is about 1066.6099107280.

The spelling of 1213435913 in words is "one billion, two hundred thirteen million, four hundred thirty-five thousand, nine hundred thirteen".