12521515 has 8 divisors (see below), whose sum is σ = 15309648. Its totient is φ = 9828000.

The previous prime is 12521507. The next prime is 12521519. The reversal of 12521515 is 51512521.

It is a happy number.

12521515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12521515 - 2³ = 12521507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23361 + ... + 23890.

It is an arithmetic number, because the mean of its divisors is an integer number (1913706).

Almost surely, 2^12521515 is an apocalyptic number.

12521515 is a deficient number, since it is larger than the sum of its proper divisors (2788133).

12521515 is an equidigital number, since it uses as much as digits as its factorization.

12521515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47309.

The product of its digits is 500, while the sum is 22.

The square root of 12521515 is about 3538.5752782723. The cubic root of 12521515 is about 232.2125170717.

The spelling of 12521515 in words is "twelve million, five hundred twenty-one thousand, five hundred fifteen".