12528891 has 8 divisors (see below), whose sum is σ = 18561360. Its totient is φ = 8352576.

The previous prime is 12528889. The next prime is 12528907. The reversal of 12528891 is 19882521.

12528891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12528891 - 2¹ = 12528889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12528871) 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 7 ways as a sum of consecutive naturals, for example, 231990 + ... + 232043.

It is an arithmetic number, because the mean of its divisors is an integer number (2320170).

Almost surely, 2^12528891 is an apocalyptic number.

12528891 is a deficient number, since it is larger than the sum of its proper divisors (6032469).

12528891 is an equidigital number, since it uses as much as digits as its factorization.

12528891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464042 (or 464036 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12528891 is about 3539.6173522007. The cubic root of 12528891 is about 232.2581042955.

The spelling of 12528891 in words is "twelve million, five hundred twenty-eight thousand, eight hundred ninety-one".