12515257 has 4 divisors (see below), whose sum is σ = 12727440. Its totient is φ = 12303076.

The previous prime is 12515203. The next prime is 12515311. The reversal of 12515257 is 75251521.

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 an emirpimes, since its reverse is a distinct semiprime: 75251521 = 1873 ⋅40177.

It is an interprime number because it is at equal distance from previous prime (12515203) and next prime (12515311).

It is a cyclic number.

It is not a de Polignac number, because 12515257 - 2¹¹ = 12513209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12515957) 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, 106003 + ... + 106120.

It is an arithmetic number, because the mean of its divisors is an integer number (3181860).

Almost surely, 2^12515257 is an apocalyptic number.

It is an amenable number.

12515257 is a deficient number, since it is larger than the sum of its proper divisors (212183).

12515257 is an equidigital number, since it uses as much as digits as its factorization.

12515257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212182.

The product of its digits is 3500, while the sum is 28.

The square root of 12515257 is about 3537.6909135763. The cubic root of 12515257 is about 232.1738255851.

Adding to 12515257 its reverse (75251521), we get a palindrome (87766778).

The spelling of 12515257 in words is "twelve million, five hundred fifteen thousand, two hundred fifty-seven".