13018509 has 16 divisors (see below), whose sum is σ = 22042240. Its totient is φ = 7439040.

The previous prime is 13018501. The next prime is 13018513. The reversal of 13018509 is 90581031.

13018509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13018509 - 2³ = 13018501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13018501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34252 + ... + 34629.

It is an arithmetic number, because the mean of its divisors is an integer number (1377640).

Almost surely, 2^13018509 is an apocalyptic number.

It is an amenable number.

13018509 is a deficient number, since it is larger than the sum of its proper divisors (9023731).

13018509 is an equidigital number, since it uses as much as digits as its factorization.

13018509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68897 (or 68891 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 13018509 is about 3608.1170989867. The cubic root of 13018509 is about 235.2450077862.

The spelling of 13018509 in words is "thirteen million, eighteen thousand, five hundred nine".