13756681 has 3 divisors (see below), whose sum is σ = 13760391. Its totient is φ = 13752972.

The previous prime is 13756679. The next prime is 13756697. The reversal of 13756681 is 18665731.

The square root of 13756681 is 3709.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3644281 + 10112400 = 1909^2 + 3180^2 .

It is not a de Polignac number, because 13756681 - 2¹ = 13756679 is a prime.

It is a super-2 number, since 2×13756681² = 378492544271522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13756681.

It is not an unprimeable number, because it can be changed into a prime (13756081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1855 + ... + 5563.

It is an arithmetic number, because the mean of its divisors is an integer number (4586797).

Almost surely, 2^13756681 is an apocalyptic number.

13756681 is the 3709-th square number.

13756681 is the 1855-th centered octagonal number.

It is an amenable number.

13756681 is a deficient number, since it is larger than the sum of its proper divisors (3710).

13756681 is an frugal number, since it uses more digits than its factorization.

13756681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7418 (or 3709 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The cubic root of 13756681 is about 239.6097883595.

The spelling of 13756681 in words is "thirteen million, seven hundred fifty-six thousand, six hundred eighty-one".