13685281 has 4 divisors (see below), whose sum is σ = 13776064. Its totient is φ = 13594500.

The previous prime is 13685279. The next prime is 13685297. The reversal of 13685281 is 18258631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18258631 = 1723 ⋅10597.

It is a cyclic number.

It is not a de Polignac number, because 13685281 - 2¹ = 13685279 is a prime.

It is a super-2 number, since 2×13685281² = 374573832097922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13685201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45165 + ... + 45466.

It is an arithmetic number, because the mean of its divisors is an integer number (3444016).

Almost surely, 2^13685281 is an apocalyptic number.

It is an amenable number.

13685281 is a deficient number, since it is larger than the sum of its proper divisors (90783).

13685281 is an equidigital number, since it uses as much as digits as its factorization.

13685281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90782.

The product of its digits is 11520, while the sum is 34.

The square root of 13685281 is about 3699.3622423331. The cubic root of 13685281 is about 239.1945277604.

The spelling of 13685281 in words is "thirteen million, six hundred eighty-five thousand, two hundred eighty-one".