13523729 has 2 divisors, whose sum is σ = 13523730. Its totient is φ = 13523728.

The previous prime is 13523717. The next prime is 13523743. The reversal of 13523729 is 92732531.

13523729 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9443329 + 4080400 = 3073^2 + 2020^2 .

It is an emirp because it is prime and its reverse (92732531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13523729 - 2¹² = 13519633 is a prime.

It is equal to p₈₈₁₀₆₉ and since 13523729 and 881069 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 13523695 and 13523704.

It is not a weakly prime, because it can be changed into another prime (13523779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6761864 + 6761865.

It is an arithmetic number, because the mean of its divisors is an integer number (6761865).

Almost surely, 2^13523729 is an apocalyptic number.

It is an amenable number.

13523729 is a deficient number, since it is larger than the sum of its proper divisors (1).

13523729 is an equidigital number, since it uses as much as digits as its factorization.

13523729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 13523729 is about 3677.4623043615. The cubic root of 13523729 is about 238.2495851719.

The spelling of 13523729 in words is "thirteen million, five hundred twenty-three thousand, seven hundred twenty-nine".