13287609 has 6 divisors (see below), whose sum is σ = 19193226. Its totient is φ = 8858400.

The previous prime is 13287607. The next prime is 13287619. The reversal of 13287609 is 90678231.

It can be written as a sum of positive squares in only one way, i.e., 7868025 + 5419584 = 2805^2 + 2328^2 .

It is not a de Polignac number, because 13287609 - 2¹ = 13287607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13287607) 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, 738192 + ... + 738209.

It is an arithmetic number, because the mean of its divisors is an integer number (3198871).

Almost surely, 2^13287609 is an apocalyptic number.

It is an amenable number.

13287609 is a deficient number, since it is larger than the sum of its proper divisors (5905617).

13287609 is a wasteful number, since it uses less digits than its factorization.

13287609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476407 (or 1476404 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 13287609 is about 3645.2172774747. The cubic root of 13287609 is about 236.8548488971.

The spelling of 13287609 in words is "thirteen million, two hundred eighty-seven thousand, six hundred nine".