13681637 has 4 divisors (see below), whose sum is σ = 13846560. Its totient is φ = 13516716.

The previous prime is 13681621. The next prime is 13681639. The reversal of 13681637 is 73618631.

13681637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 73618631 = 1571 ⋅46861.

It is not a de Polignac number, because 13681637 - 2⁴ = 13681621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13681597 and 13681606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681639) 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, 82337 + ... + 82502.

It is an arithmetic number, because the mean of its divisors is an integer number (3461640).

Almost surely, 2^13681637 is an apocalyptic number.

It is an amenable number.

13681637 is a deficient number, since it is larger than the sum of its proper divisors (164923).

13681637 is an equidigital number, since it uses as much as digits as its factorization.

13681637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164922.

The product of its digits is 18144, while the sum is 35.

The square root of 13681637 is about 3698.8696922168. The cubic root of 13681637 is about 239.1732956490.

The spelling of 13681637 in words is "thirteen million, six hundred eighty-one thousand, six hundred thirty-seven".