1213418229509 has 2 divisors, whose sum is σ = 1213418229510. Its totient is φ = 1213418229508.

The previous prime is 1213418229473. The next prime is 1213418229559. The reversal of 1213418229509 is 9059228143121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656375428900 + 557042800609 = 810170^2 + 746353^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213418229509 - 2⁸ = 1213418229253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213418229559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606709114754 + 606709114755.

It is an arithmetic number, because the mean of its divisors is an integer number (606709114755).

Almost surely, 2^{1213418229509} is an apocalyptic number.

It is an amenable number.

1213418229509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213418229509 is an equidigital number, since it uses as much as digits as its factorization.

1213418229509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 1213418229509 in words is "one trillion, two hundred thirteen billion, four hundred eighteen million, two hundred twenty-nine thousand, five hundred nine".