13938643489 has 2 divisors, whose sum is σ = 13938643490. Its totient is φ = 13938643488.

The previous prime is 13938643487. The next prime is 13938643513. The reversal of 13938643489 is 98434683931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7105141264 + 6833502225 = 84292^2 + 82665^2 .

It is a cyclic number.

It is not a de Polignac number, because 13938643489 - 2¹ = 13938643487 is a prime.

Together with 13938643487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13938643487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969321744 + 6969321745.

It is an arithmetic number, because the mean of its divisors is an integer number (6969321745).

Almost surely, 2^13938643489 is an apocalyptic number.

It is an amenable number.

13938643489 is a deficient number, since it is larger than the sum of its proper divisors (1).

13938643489 is an equidigital number, since it uses as much as digits as its factorization.

13938643489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 58.

The spelling of 13938643489 in words is "thirteen billion, nine hundred thirty-eight million, six hundred forty-three thousand, four hundred eighty-nine".