12531538 has 8 divisors (see below), whose sum is σ = 19445580. Its totient is φ = 6049680.

The previous prime is 12531529. The next prime is 12531539. The reversal of 12531538 is 83513521.

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 91809 = 3527^2 + 303^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12531539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107973 + ... + 108088.

Almost surely, 2^12531538 is an apocalyptic number.

12531538 is a deficient number, since it is larger than the sum of its proper divisors (6914042).

12531538 is a wasteful number, since it uses less digits than its factorization.

12531538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216092.

The product of its digits is 3600, while the sum is 28.

The square root of 12531538 is about 3539.9912429270. The cubic root of 12531538 is about 232.2744596646.

The spelling of 12531538 in words is "twelve million, five hundred thirty-one thousand, five hundred thirty-eight".