13003649 has 4 divisors (see below), whose sum is σ = 13132500. Its totient is φ = 12874800.

The previous prime is 13003643. The next prime is 13003699. The reversal of 13003649 is 94630031.

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 6927424 + 6076225 = 2632^2 + 2465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13003649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13003643) 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, 64274 + ... + 64475.

It is an arithmetic number, because the mean of its divisors is an integer number (3283125).

Almost surely, 2^13003649 is an apocalyptic number.

It is an amenable number.

13003649 is a deficient number, since it is larger than the sum of its proper divisors (128851).

13003649 is a wasteful number, since it uses less digits than its factorization.

13003649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128850.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 13003649 is about 3606.0572652136. The cubic root of 13003649 is about 235.1554667660.

The spelling of 13003649 in words is "thirteen million, three thousand, six hundred forty-nine".