13728531 has 4 divisors (see below), whose sum is σ = 18304712. Its totient is φ = 9152352.

The previous prime is 13728529. The next prime is 13728577. The reversal of 13728531 is 13582731.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 13728531 - 2¹ = 13728529 is a prime.

It is a super-2 number, since 2×13728531² = 376945126835922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13728511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2288086 + ... + 2288091.

It is an arithmetic number, because the mean of its divisors is an integer number (4576178).

Almost surely, 2^13728531 is an apocalyptic number.

13728531 is a deficient number, since it is larger than the sum of its proper divisors (4576181).

13728531 is an equidigital number, since it uses as much as digits as its factorization.

13728531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4576180.

The product of its digits is 5040, while the sum is 30.

The square root of 13728531 is about 3705.2032332923. The cubic root of 13728531 is about 239.4462406378.

The spelling of 13728531 in words is "thirteen million, seven hundred twenty-eight thousand, five hundred thirty-one".