1243040413213 has 2 divisors, whose sum is σ = 1243040413214. Its totient is φ = 1243040413212.

The previous prime is 1243040413201. The next prime is 1243040413229. The reversal of 1243040413213 is 3123140403421.

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., 1208016413604 + 35023999609 = 1099098^2 + 187147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243040413213 - 2⁹ = 1243040412701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243040413913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621520206606 + 621520206607.

It is an arithmetic number, because the mean of its divisors is an integer number (621520206607).

Almost surely, 2^{1243040413213} is an apocalyptic number.

It is an amenable number.

1243040413213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243040413213 is an equidigital number, since it uses as much as digits as its factorization.

1243040413213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1243040413213 its reverse (3123140403421), we get a palindrome (4366180816634).

The spelling of 1243040413213 in words is "one trillion, two hundred forty-three billion, forty million, four hundred thirteen thousand, two hundred thirteen".