13938643487 has 2 divisors, whose sum is σ = 13938643488. Its totient is φ = 13938643486.

The previous prime is 13938643403. The next prime is 13938643489. The reversal of 13938643487 is 78434683931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13938643487 - 2¹⁰ = 13938642463 is a prime.

Together with 13938643489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13938643489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969321743 + 6969321744.

It is an arithmetic number, because the mean of its divisors is an integer number (6969321744).

Almost surely, 2^13938643487 is an apocalyptic number.

13938643487 is a deficient number, since it is larger than the sum of its proper divisors (1).

13938643487 is an equidigital number, since it uses as much as digits as its factorization.

13938643487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 56.

The spelling of 13938643487 in words is "thirteen billion, nine hundred thirty-eight million, six hundred forty-three thousand, four hundred eighty-seven".