13648581 has 12 divisors (see below), whose sum is σ = 20445152. Its totient is φ = 9098892.

The previous prime is 13648577. The next prime is 13648619. The reversal of 13648581 is 18584631.

13648581 is a `hidden beast` number, since 1 + 3 + 648 + 5 + 8 + 1 = 666.

It is not a de Polignac number, because 13648581 - 2² = 13648577 is a prime.

It is a super-2 number, since 2×13648581² = 372567526627122, 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 (13648511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27841 + ... + 28326.

Almost surely, 2^13648581 is an apocalyptic number.

It is an amenable number.

13648581 is a deficient number, since it is larger than the sum of its proper divisors (6796571).

13648581 is an frugal number, since it uses more digits than its factorization.

13648581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56182 (or 56170 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 13648581 is about 3694.3985978776. The cubic root of 13648581 is about 238.9805192948.

The spelling of 13648581 in words is "thirteen million, six hundred forty-eight thousand, five hundred eighty-one".