13328561 has 8 divisors (see below), whose sum is σ = 14345064. Its totient is φ = 12337920.

The previous prime is 13328537. The next prime is 13328563. The reversal of 13328561 is 16582331.

It can be written as a sum of positive squares in 4 ways, for example, as 144400 + 13184161 = 380^2 + 3631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-13328561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13328563) 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 7 ways as a sum of consecutive naturals, for example, 5390 + ... + 7463.

It is an arithmetic number, because the mean of its divisors is an integer number (1793133).

Almost surely, 2^13328561 is an apocalyptic number.

It is an amenable number.

13328561 is a deficient number, since it is larger than the sum of its proper divisors (1016503).

13328561 is a wasteful number, since it uses less digits than its factorization.

13328561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12931.

The product of its digits is 4320, while the sum is 29.

The square root of 13328561 is about 3650.8301795619. The cubic root of 13328561 is about 237.0979257892.

The spelling of 13328561 in words is "thirteen million, three hundred twenty-eight thousand, five hundred sixty-one".