13213918517 has 6 divisors (see below), whose sum is σ = 13315575414. Its totient is φ = 13113031880.

The previous prime is 13213918499. The next prime is 13213918519. The reversal of 13213918517 is 71581931231.

13213918517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12428013361 + 785905156 = 111481^2 + 28034^2 .

It is not a de Polignac number, because 13213918517 - 2⁸ = 13213918261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13213918519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367838 + ... + 402159.

It is an arithmetic number, because the mean of its divisors is an integer number (2219262569).

Almost surely, 2^13213918517 is an apocalyptic number.

It is an amenable number.

13213918517 is a deficient number, since it is larger than the sum of its proper divisors (101656897).

13213918517 is an frugal number, since it uses more digits than its factorization.

13213918517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770259 (or 770128 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The spelling of 13213918517 in words is "thirteen billion, two hundred thirteen million, nine hundred eighteen thousand, five hundred seventeen".