13256689 has 4 divisors (see below), whose sum is σ = 13378420. Its totient is φ = 13134960.

The previous prime is 13256657. The next prime is 13256701. The reversal of 13256689 is 98665231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98665231 = 7 ⋅14095033.

It can be written as a sum of positive squares in 2 ways, for example, as 5721664 + 7535025 = 2392^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 13256689 - 2⁵ = 13256657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13257689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60702 + ... + 60919.

It is an arithmetic number, because the mean of its divisors is an integer number (3344605).

Almost surely, 2^13256689 is an apocalyptic number.

It is an amenable number.

13256689 is a deficient number, since it is larger than the sum of its proper divisors (121731).

13256689 is a wasteful number, since it uses less digits than its factorization.

13256689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121730.

The product of its digits is 77760, while the sum is 40.

The square root of 13256689 is about 3640.9736335217. The cubic root of 13256689 is about 236.6709873795.

The spelling of 13256689 in words is "thirteen million, two hundred fifty-six thousand, six hundred eighty-nine".