13681791 has 20 divisors (see below), whose sum is σ = 20830392. Its totient is φ = 8946288.

The previous prime is 13681777. The next prime is 13681793. The reversal of 13681791 is 19718631.

It is not a de Polignac number, because 13681791 - 2⁶ = 13681727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2700 + ... + 5886.

Almost surely, 2^13681791 is an apocalyptic number.

13681791 is a deficient number, since it is larger than the sum of its proper divisors (7148601).

13681791 is an equidigital number, since it uses as much as digits as its factorization.

13681791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252 (or 3243 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 13681791 is about 3698.8905093284. The cubic root of 13681791 is about 239.1741930209.

The spelling of 13681791 in words is "thirteen million, six hundred eighty-one thousand, seven hundred ninety-one".