13259681 has 4 divisors (see below), whose sum is σ = 13271700. Its totient is φ = 13247664.

The previous prime is 13259669. The next prime is 13259693. The reversal of 13259681 is 18695231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18695231 = 269 ⋅69499.

It is an interprime number because it is at equal distance from previous prime (13259669) and next prime (13259693).

It can be written as a sum of positive squares in 2 ways, for example, as 10504081 + 2755600 = 3241^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 13259681 - 2¹⁴ = 13243297 is a prime.

It is a super-2 number, since 2×13259681² = 351638280443522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13259611) 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 3 ways as a sum of consecutive naturals, for example, 4166 + ... + 6623.

It is an arithmetic number, because the mean of its divisors is an integer number (3317925).

Almost surely, 2^13259681 is an apocalyptic number.

It is an amenable number.

13259681 is a deficient number, since it is larger than the sum of its proper divisors (12019).

13259681 is a wasteful number, since it uses less digits than its factorization.

13259681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018.

The product of its digits is 12960, while the sum is 35.

The square root of 13259681 is about 3641.3844894490. The cubic root of 13259681 is about 236.6887913809.

The spelling of 13259681 in words is "thirteen million, two hundred fifty-nine thousand, six hundred eighty-one".