13757681 has 6 divisors (see below), whose sum is σ = 16003890. Its totient is φ = 11792256.

The previous prime is 13757671. The next prime is 13757683. The reversal of 13757681 is 18675731.

It can be written as a sum of positive squares in only one way, i.e., 10368400 + 3389281 = 3220^2 + 1841^2 .

It is not a de Polignac number, because 13757681 - 2¹⁰ = 13756657 is a prime.

It is a super-2 number, since 2×13757681² = 378547572995522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13757683) 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, 140336 + ... + 140433.

It is an arithmetic number, because the mean of its divisors is an integer number (2667315).

Almost surely, 2^13757681 is an apocalyptic number.

It is an amenable number.

13757681 is a deficient number, since it is larger than the sum of its proper divisors (2246209).

13757681 is an equidigital number, since it uses as much as digits as its factorization.

13757681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280783 (or 280776 counting only the distinct ones).

The product of its digits is 35280, while the sum is 38.

The square root of 13757681 is about 3709.1348047759. The cubic root of 13757681 is about 239.6155941200.

The spelling of 13757681 in words is "thirteen million, seven hundred fifty-seven thousand, six hundred eighty-one".