13081509 has 12 divisors (see below), whose sum is σ = 21594976. Its totient is φ = 7475112.

The previous prime is 13081507. The next prime is 13081559. The reversal of 13081509 is 90518031.

It is not a de Polignac number, because 13081509 - 2¹ = 13081507 is a prime.

It is a super-2 number, since 2×13081509² = 342251755434162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103759 + ... + 103884.

Almost surely, 2^13081509 is an apocalyptic number.

It is an amenable number.

13081509 is a deficient number, since it is larger than the sum of its proper divisors (8513467).

13081509 is a wasteful number, since it uses less digits than its factorization.

13081509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207656 (or 207653 counting only the distinct ones).

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

The square root of 13081509 is about 3616.8368777151. The cubic root of 13081509 is about 235.6238681941.

The spelling of 13081509 in words is "thirteen million, eighty-one thousand, five hundred nine".