13645281 has 16 divisors (see below), whose sum is σ = 19800704. Its totient is φ = 8308224.

The previous prime is 13645259. The next prime is 13645321. The reversal of 13645281 is 18254631.

It is not a de Polignac number, because 13645281 - 2⁶ = 13645217 is a prime.

It is a super-2 number, since 2×13645281² = 372387387137922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13645481) 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 15 ways as a sum of consecutive naturals, for example, 1980 + ... + 5586.

It is an arithmetic number, because the mean of its divisors is an integer number (1237544).

Almost surely, 2^13645281 is an apocalyptic number.

It is an amenable number.

13645281 is a deficient number, since it is larger than the sum of its proper divisors (6155423).

13645281 is a wasteful number, since it uses less digits than its factorization.

13645281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720.

The product of its digits is 5760, while the sum is 30.

The square root of 13645281 is about 3693.9519487941. The cubic root of 13645281 is about 238.9612572366.

The spelling of 13645281 in words is "thirteen million, six hundred forty-five thousand, two hundred eighty-one".