13318505 has 4 divisors (see below), whose sum is σ = 15982212. Its totient is φ = 10654800.

The previous prime is 13318493. The next prime is 13318507. The reversal of 13318505 is 50581331.

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 6574096 + 6744409 = 2564^2 + 2597^2 .

It is not a de Polignac number, because 13318505 - 2⁶ = 13318441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13318507) 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, 1331846 + ... + 1331855.

It is an arithmetic number, because the mean of its divisors is an integer number (3995553).

Almost surely, 2^13318505 is an apocalyptic number.

It is an amenable number.

13318505 is a deficient number, since it is larger than the sum of its proper divisors (2663707).

13318505 is an equidigital number, since it uses as much as digits as its factorization.

13318505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663706.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 13318505 is about 3649.4526986933. The cubic root of 13318505 is about 237.0382830263.

Adding to 13318505 its reverse (50581331), we get a palindrome (63899836).

The spelling of 13318505 in words is "thirteen million, three hundred eighteen thousand, five hundred five".