12521279 has 4 divisors (see below), whose sum is σ = 12584400. Its totient is φ = 12458160.

The previous prime is 12521239. The next prime is 12521291. The reversal of 12521279 is 97212521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12521279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521219) 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, 31262 + ... + 31659.

It is an arithmetic number, because the mean of its divisors is an integer number (3146100).

Almost surely, 2^12521279 is an apocalyptic number.

12521279 is a deficient number, since it is larger than the sum of its proper divisors (63121).

12521279 is an equidigital number, since it uses as much as digits as its factorization.

12521279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63120.

The product of its digits is 2520, while the sum is 29.

The square root of 12521279 is about 3538.5419313610. The cubic root of 12521279 is about 232.2110581828.

The spelling of 12521279 in words is "twelve million, five hundred twenty-one thousand, two hundred seventy-nine".