13509073 has 6 divisors (see below), whose sum is σ = 14122514. Its totient is φ = 12921216.

The previous prime is 13509061. The next prime is 13509077. The reversal of 13509073 is 37090531.

It can be written as a sum of positive squares in only one way, i.e., 13373649 + 135424 = 3657^2 + 368^2 .

It is not a de Polignac number, because 13509073 - 2¹³ = 13500881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13509077) 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 5 ways as a sum of consecutive naturals, for example, 12240 + ... + 13297.

Almost surely, 2^13509073 is an apocalyptic number.

It is an amenable number.

13509073 is a deficient number, since it is larger than the sum of its proper divisors (613441).

13509073 is an equidigital number, since it uses as much as digits as its factorization.

13509073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25583 (or 25560 counting only the distinct ones).

The product of its (nonzero) digits is 2835, while the sum is 28.

The square root of 13509073 is about 3675.4690857087. The cubic root of 13509073 is about 238.1634884042.

The spelling of 13509073 in words is "thirteen million, five hundred nine thousand, seventy-three".