13686529 has 2 divisors, whose sum is σ = 13686530. Its totient is φ = 13686528.

The previous prime is 13686527. The next prime is 13686553. The reversal of 13686529 is 92568631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7436529 + 6250000 = 2727^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 13686529 - 2¹ = 13686527 is a prime.

Together with 13686527, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13686491 and 13686500.

It is not a weakly prime, because it can be changed into another prime (13686523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6843264 + 6843265.

It is an arithmetic number, because the mean of its divisors is an integer number (6843265).

Almost surely, 2^13686529 is an apocalyptic number.

It is an amenable number.

13686529 is a deficient number, since it is larger than the sum of its proper divisors (1).

13686529 is an equidigital number, since it uses as much as digits as its factorization.

13686529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 13686529 is about 3699.5309162109. The cubic root of 13686529 is about 239.2017984843.

The spelling of 13686529 in words is "thirteen million, six hundred eighty-six thousand, five hundred twenty-nine".