1223738523613 has 2 divisors, whose sum is σ = 1223738523614. Its totient is φ = 1223738523612.

The previous prime is 1223738523589. The next prime is 1223738523649. The reversal of 1223738523613 is 3163258373221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 803914871769 + 419823651844 = 896613^2 + 647938^2 .

It is a cyclic number.

It is not a de Polignac number, because 1223738523613 - 2³⁷ = 1086299570141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1223738523713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611869261806 + 611869261807.

It is an arithmetic number, because the mean of its divisors is an integer number (611869261807).

Almost surely, 2^{1223738523613} is an apocalyptic number.

It is an amenable number.

1223738523613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223738523613 is an equidigital number, since it uses as much as digits as its factorization.

1223738523613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 46.

The spelling of 1223738523613 in words is "one trillion, two hundred twenty-three billion, seven hundred thirty-eight million, five hundred twenty-three thousand, six hundred thirteen".