13018913 has 4 divisors (see below), whose sum is σ = 13026180. Its totient is φ = 13011648.

The previous prime is 13018909. The next prime is 13018919. The reversal of 13018913 is 31981031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7006609 + 6012304 = 2647^2 + 2452^2 .

It is a cyclic number.

It is not a de Polignac number, because 13018913 - 2² = 13018909 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 (13018919) 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, 1181 + ... + 5237.

It is an arithmetic number, because the mean of its divisors is an integer number (3256545).

Almost surely, 2^13018913 is an apocalyptic number.

It is an amenable number.

13018913 is a deficient number, since it is larger than the sum of its proper divisors (7267).

13018913 is an equidigital number, since it uses as much as digits as its factorization.

13018913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 13018913 is about 3608.1730834316. The cubic root of 13018913 is about 235.2474411934.

Adding to 13018913 its reverse (31981031), we get a palindrome (44999944).

It can be divided in two parts, 13018 and 913, that added together give a palindrome (13931).

The spelling of 13018913 in words is "thirteen million, eighteen thousand, nine hundred thirteen".