13706681 has 4 divisors (see below), whose sum is σ = 14148864. Its totient is φ = 13264500.

The previous prime is 13706663. The next prime is 13706683. The reversal of 13706681 is 18660731.

13706681 is digitally balanced in base 2 and base 3, because in such bases 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: 18660731 = 151 ⋅123581.

It is a cyclic number.

It is not a de Polignac number, because 13706681 - 2¹⁸ = 13444537 is a prime.

It is a super-2 number, since 2×13706681² = 375746208071522, 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 (13706683) 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, 221045 + ... + 221106.

It is an arithmetic number, because the mean of its divisors is an integer number (3537216).

Almost surely, 2^13706681 is an apocalyptic number.

It is an amenable number.

13706681 is a deficient number, since it is larger than the sum of its proper divisors (442183).

13706681 is an equidigital number, since it uses as much as digits as its factorization.

13706681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442182.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 13706681 is about 3702.2535029357. The cubic root of 13706681 is about 239.3191408904.

The spelling of 13706681 in words is "thirteen million, seven hundred six thousand, six hundred eighty-one".