13145509 has 8 divisors (see below), whose sum is σ = 14288120. Its totient is φ = 12021696.

The previous prime is 13145507. The next prime is 13145513. The reversal of 13145509 is 90554131.

It can be written as a sum of positive squares in 4 ways, for example, as 2712609 + 10432900 = 1647^2 + 3230^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13145509 - 2¹ = 13145507 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 (13145507) 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 7 ways as a sum of consecutive naturals, for example, 3222 + ... + 6055.

It is an arithmetic number, because the mean of its divisors is an integer number (1786015).

Almost surely, 2^13145509 is an apocalyptic number.

It is an amenable number.

13145509 is a deficient number, since it is larger than the sum of its proper divisors (1142611).

13145509 is a wasteful number, since it uses less digits than its factorization.

13145509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9399.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 13145509 is about 3625.6735925894. The cubic root of 13145509 is about 236.0074988041.

The spelling of 13145509 in words is "thirteen million, one hundred forty-five thousand, five hundred nine".