13006505 has 4 divisors (see below), whose sum is σ = 15607812. Its totient is φ = 10405200.

The previous prime is 13006501. The next prime is 13006537. The reversal of 13006505 is 50560031.

13006505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4227136 + 8779369 = 2056^2 + 2963^2 .

It is not a de Polignac number, because 13006505 - 2² = 13006501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13006501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300646 + ... + 1300655.

It is an arithmetic number, because the mean of its divisors is an integer number (3901953).

Almost surely, 2^13006505 is an apocalyptic number.

It is an amenable number.

13006505 is a deficient number, since it is larger than the sum of its proper divisors (2601307).

13006505 is an equidigital number, since it uses as much as digits as its factorization.

13006505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601306.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 13006505 is about 3606.4532438394. The cubic root of 13006505 is about 235.1726812891.

Adding to 13006505 its reverse (50560031), we get a palindrome (63566536).

The spelling of 13006505 in words is "thirteen million, six thousand, five hundred five".