12685281 has 16 divisors (see below), whose sum is σ = 20467584. Its totient is φ = 6822144.

The previous prime is 12685273. The next prime is 12685291. The reversal of 12685281 is 18258621.

12685281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12685281 - 2³ = 12685273 is a prime.

It is a super-2 number, since 2×12685281² = 321832708097922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12685201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17410 + ... + 18123.

It is an arithmetic number, because the mean of its divisors is an integer number (1279224).

Almost surely, 2^12685281 is an apocalyptic number.

It is an amenable number.

12685281 is a deficient number, since it is larger than the sum of its proper divisors (7782303).

12685281 is a wasteful number, since it uses less digits than its factorization.

12685281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35560.

The product of its digits is 7680, while the sum is 33.

The square root of 12685281 is about 3561.6402120371. The cubic root of 12685281 is about 233.2204867028.

The spelling of 12685281 in words is "twelve million, six hundred eighty-five thousand, two hundred eighty-one".