1243101311201 has 2 divisors, whose sum is σ = 1243101311202. Its totient is φ = 1243101311200.

The previous prime is 1243101311189. The next prime is 1243101311203. The reversal of 1243101311201 is 1021131013421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176910371025 + 66190940176 = 1084855^2 + 257276^2 .

It is an emirp because it is prime and its reverse (1021131013421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243101311201 - 2¹⁴ = 1243101294817 is a prime.

Together with 1243101311203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1243101311203) 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, 621550655600 + 621550655601.

It is an arithmetic number, because the mean of its divisors is an integer number (621550655601).

Almost surely, 2^{1243101311201} is an apocalyptic number.

It is an amenable number.

1243101311201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243101311201 is an equidigital number, since it uses as much as digits as its factorization.

1243101311201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1243101311201 its reverse (1021131013421), we get a palindrome (2264232324622).

The spelling of 1243101311201 in words is "one trillion, two hundred forty-three billion, one hundred one million, three hundred eleven thousand, two hundred one".