13539537 has 18 divisors (see below), whose sum is σ = 21498386. Its totient is φ = 8205120.

The previous prime is 13539511. The next prime is 13539557. The reversal of 13539537 is 73593531.

It is a happy number.

13539537 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9217296 + 4322241 = 3036^2 + 2079^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13539537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13539557) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5128 + ... + 7305.

Almost surely, 2^13539537 is an apocalyptic number.

It is an amenable number.

13539537 is a deficient number, since it is larger than the sum of its proper divisors (7958849).

13539537 is a wasteful number, since it uses less digits than its factorization.

13539537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12461 (or 12447 counting only the distinct ones).

The product of its digits is 42525, while the sum is 36.

The square root of 13539537 is about 3679.6109848733. The cubic root of 13539537 is about 238.3423796698.

The spelling of 13539537 in words is "thirteen million, five hundred thirty-nine thousand, five hundred thirty-seven".