13971061856789 has 2 divisors, whose sum is σ = 13971061856790. Its totient is φ = 13971061856788.

The previous prime is 13971061856771. The next prime is 13971061856887. The reversal of 13971061856789 is 98765816017931.

13971061856789 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 can be written as a sum of positive squares in only one way, i.e., 8287806111025 + 5683255745764 = 2878855^2 + 2383958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13971061856789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13971061855789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6985530928394 + 6985530928395.

It is an arithmetic number, because the mean of its divisors is an integer number (6985530928395).

Almost surely, 2^{13971061856789} is an apocalyptic number.

It is an amenable number.

13971061856789 is a deficient number, since it is larger than the sum of its proper divisors (1).

13971061856789 is an equidigital number, since it uses as much as digits as its factorization.

13971061856789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 13971061856789 in words is "thirteen trillion, nine hundred seventy-one billion, sixty-one million, eight hundred fifty-six thousand, seven hundred eighty-nine".