13681009 has 8 divisors (see below), whose sum is σ = 14379200. Its totient is φ = 13000176.

The previous prime is 13680949. The next prime is 13681033. The reversal of 13681009 is 90018631.

It is a happy number.

13681009 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13681009 - 2¹¹ = 13678961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13681099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2709 + ... + 5890.

It is an arithmetic number, because the mean of its divisors is an integer number (1797400).

Almost surely, 2^13681009 is an apocalyptic number.

It is an amenable number.

13681009 is a deficient number, since it is larger than the sum of its proper divisors (698191).

13681009 is an equidigital number, since it uses as much as digits as its factorization.

13681009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8679.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 13681009 is about 3698.7848004446. The cubic root of 13681009 is about 239.1696361666.

The spelling of 13681009 in words is "thirteen million, six hundred eighty-one thousand, nine".