11311601243 has 2 divisors, whose sum is σ = 11311601244. Its totient is φ = 11311601242.

The previous prime is 11311601239. The next prime is 11311601297. The reversal of 11311601243 is 34210611311.

It is a happy number.

11311601243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (34210611311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11311601243 - 2² = 11311601239 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (11311601443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655800621 + 5655800622.

It is an arithmetic number, because the mean of its divisors is an integer number (5655800622).

Almost surely, 2^11311601243 is an apocalyptic number.

11311601243 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311601243 is an equidigital number, since it uses as much as digits as its factorization.

11311601243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 11311601243 in words is "eleven billion, three hundred eleven million, six hundred one thousand, two hundred forty-three".