13005308509 has 4 divisors (see below), whose sum is σ = 13006003804. Its totient is φ = 13004613216.

The previous prime is 13005308507. The next prime is 13005308539. The reversal of 13005308509 is 90580350031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90580350031 = 61 ⋅1484923771.

It can be written as a sum of positive squares in 2 ways, for example, as 7232652025 + 5772656484 = 85045^2 + 75978^2 .

It is a cyclic number.

It is not a de Polignac number, because 13005308509 - 2¹ = 13005308507 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 (13005308507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318792 + ... + 357265.

It is an arithmetic number, because the mean of its divisors is an integer number (3251500951).

Almost surely, 2^13005308509 is an apocalyptic number.

It is an amenable number.

13005308509 is a deficient number, since it is larger than the sum of its proper divisors (695295).

13005308509 is an equidigital number, since it uses as much as digits as its factorization.

13005308509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695294.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 13005308509 in words is "thirteen billion, five million, three hundred eight thousand, five hundred nine".