12531487 has 4 divisors (see below), whose sum is σ = 12584160. Its totient is φ = 12478816.

The previous prime is 12531473. The next prime is 12531511. The reversal of 12531487 is 78413521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78413521 = 4021 ⋅19501.

It is a cyclic number.

It is not a de Polignac number, because 12531487 - 2⁷ = 12531359 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25978 + ... + 26455.

It is an arithmetic number, because the mean of its divisors is an integer number (3146040).

Almost surely, 2^12531487 is an apocalyptic number.

12531487 is a deficient number, since it is larger than the sum of its proper divisors (52673).

12531487 is an equidigital number, since it uses as much as digits as its factorization.

12531487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52672.

The product of its digits is 6720, while the sum is 31.

The square root of 12531487 is about 3539.9840395120. The cubic root of 12531487 is about 232.2741445659.

The spelling of 12531487 in words is "twelve million, five hundred thirty-one thousand, four hundred eighty-seven".