13938378529 has 2 divisors, whose sum is σ = 13938378530. Its totient is φ = 13938378528.

The previous prime is 13938378527. The next prime is 13938378533. The reversal of 13938378529 is 92587383931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10618890304 + 3319488225 = 103048^2 + 57615^2 .

It is a cyclic number.

It is not a de Polignac number, because 13938378529 - 2¹ = 13938378527 is a prime.

Together with 13938378527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13938378527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969189264 + 6969189265.

It is an arithmetic number, because the mean of its divisors is an integer number (6969189265).

Almost surely, 2^13938378529 is an apocalyptic number.

It is an amenable number.

13938378529 is a deficient number, since it is larger than the sum of its proper divisors (1).

13938378529 is an equidigital number, since it uses as much as digits as its factorization.

13938378529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 58.

The spelling of 13938378529 in words is "thirteen billion, nine hundred thirty-eight million, three hundred seventy-eight thousand, five hundred twenty-nine".