13071681 has 18 divisors (see below), whose sum is σ = 21964722. Its totient is φ = 7469280.

The previous prime is 13071673. The next prime is 13071683. The reversal of 13071681 is 18617031.

13071681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12895281 + 176400 = 3591^2 + 420^2 .

It is not a de Polignac number, because 13071681 - 2³ = 13071673 is a prime.

It is a super-2 number, since 2×13071681² = 341737688331522, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13071683) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14380 + ... + 15261.

Almost surely, 2^13071681 is an apocalyptic number.

It is an amenable number.

13071681 is a deficient number, since it is larger than the sum of its proper divisors (8893041).

13071681 is a wasteful number, since it uses less digits than its factorization.

13071681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29661 (or 29651 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 13071681 is about 3615.4779766996. The cubic root of 13071681 is about 235.5648461669.

The spelling of 13071681 in words is "thirteen million, seventy-one thousand, six hundred eighty-one".