13538779 has 2 divisors, whose sum is σ = 13538780. Its totient is φ = 13538778.

The previous prime is 13538731. The next prime is 13538813. The reversal of 13538779 is 97783531.

It is a strong prime.

It is an emirp because it is prime and its reverse (97783531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13538779 - 2¹⁵ = 13506011 is a prime.

It is not a weakly prime, because it can be changed into another prime (13538729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769389 + 6769390.

It is an arithmetic number, because the mean of its divisors is an integer number (6769390).

Almost surely, 2^13538779 is an apocalyptic number.

13538779 is a deficient number, since it is larger than the sum of its proper divisors (1).

13538779 is an equidigital number, since it uses as much as digits as its factorization.

13538779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 13538779 is about 3679.5079834130. The cubic root of 13538779 is about 238.3379317852.

The spelling of 13538779 in words is "thirteen million, five hundred thirty-eight thousand, seven hundred seventy-nine".