12539533 has 4 divisors (see below), whose sum is σ = 12547008. Its totient is φ = 12532060.

The previous prime is 12539509. The next prime is 12539537. The reversal of 12539533 is 33593521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12539533 - 2¹³ = 12531341 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 junction number, because it is equal to n+sod(n) for n = 12539495 and 12539504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12539537) 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, 78 + ... + 5008.

It is an arithmetic number, because the mean of its divisors is an integer number (3136752).

Almost surely, 2^12539533 is an apocalyptic number.

It is an amenable number.

12539533 is a deficient number, since it is larger than the sum of its proper divisors (7475).

12539533 is an equidigital number, since it uses as much as digits as its factorization.

12539533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7474.

The product of its digits is 12150, while the sum is 31.

The square root of 12539533 is about 3541.1203029550. The cubic root of 12539533 is about 232.3238454495.

The spelling of 12539533 in words is "twelve million, five hundred thirty-nine thousand, five hundred thirty-three".