13539649 has 4 divisors (see below), whose sum is σ = 13580164. Its totient is φ = 13499136.

The previous prime is 13539641. The next prime is 13539661. The reversal of 13539649 is 94693531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8809024 + 4730625 = 2968^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 13539649 - 2³ = 13539641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13539641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19752 + ... + 20425.

It is an arithmetic number, because the mean of its divisors is an integer number (3395041).

Almost surely, 2^13539649 is an apocalyptic number.

It is an amenable number.

13539649 is a deficient number, since it is larger than the sum of its proper divisors (40515).

13539649 is an equidigital number, since it uses as much as digits as its factorization.

13539649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40514.

The product of its digits is 87480, while the sum is 40.

The square root of 13539649 is about 3679.6262038419. The cubic root of 13539649 is about 238.3430368629.

The spelling of 13539649 in words is "thirteen million, five hundred thirty-nine thousand, six hundred forty-nine".