13478681 has 2 divisors, whose sum is σ = 13478682. Its totient is φ = 13478680.

The previous prime is 13478677. The next prime is 13478701. The reversal of 13478681 is 18687431.

13478681 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13075456 + 403225 = 3616^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 13478681 - 2² = 13478677 is a prime.

It is a super-2 number, since 2×13478681² = 363349682999522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13478611) 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 as a sum of consecutive naturals, namely, 6739340 + 6739341.

It is an arithmetic number, because the mean of its divisors is an integer number (6739341).

Almost surely, 2^13478681 is an apocalyptic number.

It is an amenable number.

13478681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13478681 is an equidigital number, since it uses as much as digits as its factorization.

13478681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 38.

The square root of 13478681 is about 3671.3323194720. The cubic root of 13478681 is about 237.9847517477.

The spelling of 13478681 in words is "thirteen million, four hundred seventy-eight thousand, six hundred eighty-one".