12521543 has 2 divisors, whose sum is σ = 12521544. Its totient is φ = 12521542.

The previous prime is 12521519. The next prime is 12521569. The reversal of 12521543 is 34512521.

12521543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12521543 - 2⁶ = 12521479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12521573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6260771 + 6260772.

It is an arithmetic number, because the mean of its divisors is an integer number (6260772).

Almost surely, 2^12521543 is an apocalyptic number.

12521543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12521543 is an equidigital number, since it uses as much as digits as its factorization.

12521543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 12521543 is about 3538.5792346647. The cubic root of 12521543 is about 232.2126901590.

The spelling of 12521543 in words is "twelve million, five hundred twenty-one thousand, five hundred forty-three".