13683581 has 8 divisors (see below), whose sum is σ = 14051928. Its totient is φ = 13320000.

The previous prime is 13683559. The next prime is 13683583. The reversal of 13683581 is 18538631.

It can be written as a sum of positive squares in 4 ways, for example, as 2859481 + 10824100 = 1691^2 + 3290^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13683581 - 2⁶ = 13683517 is a prime.

It is a super-2 number, since 2×13683581² = 374480777967122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13683583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5051 + ... + 7271.

It is an arithmetic number, because the mean of its divisors is an integer number (1756491).

Almost surely, 2^13683581 is an apocalyptic number.

It is an amenable number.

13683581 is a deficient number, since it is larger than the sum of its proper divisors (368347).

13683581 is a wasteful number, since it uses less digits than its factorization.

13683581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383.

The product of its digits is 17280, while the sum is 35.

The square root of 13683581 is about 3699.1324658628. The cubic root of 13683581 is about 239.1846230183.

The spelling of 13683581 in words is "thirteen million, six hundred eighty-three thousand, five hundred eighty-one".