13638581 has 8 divisors (see below), whose sum is σ = 14905728. Its totient is φ = 12376000.

The previous prime is 13638551. The next prime is 13638593. The reversal of 13638581 is 18583631.

13638581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13638581 - 2²² = 9444277 is a prime.

It is a super-2 number, since 2×13638581² = 372021783387122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638511) 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, 9341 + ... + 10701.

It is an arithmetic number, because the mean of its divisors is an integer number (1863216).

Almost surely, 2^13638581 is an apocalyptic number.

13638581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13638581 is a deficient number, since it is larger than the sum of its proper divisors (1267147).

13638581 is a wasteful number, since it uses less digits than its factorization.

13638581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283.

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

The square root of 13638581 is about 3693.0449496317. The cubic root of 13638581 is about 238.9221398661.

The spelling of 13638581 in words is "thirteen million, six hundred thirty-eight thousand, five hundred eighty-one".