13509863387 has 2 divisors, whose sum is σ = 13509863388. Its totient is φ = 13509863386.

The previous prime is 13509863377. The next prime is 13509863443. The reversal of 13509863387 is 78336890531.

It is a weak prime.

It is an emirp because it is prime and its reverse (78336890531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13509863387 - 2¹⁸ = 13509601243 is a prime.

It is a super-2 number, since 2×13509863387² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13509863377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6754931693 + 6754931694.

It is an arithmetic number, because the mean of its divisors is an integer number (6754931694).

Almost surely, 2^13509863387 is an apocalyptic number.

13509863387 is a deficient number, since it is larger than the sum of its proper divisors (1).

13509863387 is an equidigital number, since it uses as much as digits as its factorization.

13509863387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 13509863387 in words is "thirteen billion, five hundred nine million, eight hundred sixty-three thousand, three hundred eighty-seven".