1243405346213 has 2 divisors, whose sum is σ = 1243405346214. Its totient is φ = 1243405346212.

The previous prime is 1243405346177. The next prime is 1243405346233. The reversal of 1243405346213 is 3126435043421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1031406798724 + 211998547489 = 1015582^2 + 460433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243405346213 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243405346233) 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, 621702673106 + 621702673107.

It is an arithmetic number, because the mean of its divisors is an integer number (621702673107).

Almost surely, 2^{1243405346213} is an apocalyptic number.

It is an amenable number.

1243405346213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243405346213 is an equidigital number, since it uses as much as digits as its factorization.

1243405346213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 38.

The spelling of 1243405346213 in words is "one trillion, two hundred forty-three billion, four hundred five million, three hundred forty-six thousand, two hundred thirteen".