13377681 has 6 divisors (see below), whose sum is σ = 19323330. Its totient is φ = 8918448.

The previous prime is 13377649. The next prime is 13377701. The reversal of 13377681 is 18677331.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 3549456 = 3135^2 + 1884^2 .

It is not a de Polignac number, because 13377681 - 2⁵ = 13377649 is a prime.

It is a super-2 number, since 2×13377681² = 357924697875522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13377631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 743196 + ... + 743213.

It is an arithmetic number, because the mean of its divisors is an integer number (3220555).

Almost surely, 2^13377681 is an apocalyptic number.

It is an amenable number.

13377681 is a deficient number, since it is larger than the sum of its proper divisors (5945649).

13377681 is a wasteful number, since it uses less digits than its factorization.

13377681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486415 (or 1486412 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 13377681 is about 3657.5512299898. The cubic root of 13377681 is about 237.3888292262.

The spelling of 13377681 in words is "thirteen million, three hundred seventy-seven thousand, six hundred eighty-one".