12505257 has 6 divisors (see below), whose sum is σ = 18063162. Its totient is φ = 8336832.

The previous prime is 12505247. The next prime is 12505267. The reversal of 12505257 is 75250521.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12505247) and next prime (12505267).

It can be written as a sum of positive squares in only one way, i.e., 10361961 + 2143296 = 3219^2 + 1464^2 .

It is not a de Polignac number, because 12505257 - 2¹¹ = 12503209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12505257.

It is not an unprimeable number, because it can be changed into a prime (12505237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 694728 + ... + 694745.

It is an arithmetic number, because the mean of its divisors is an integer number (3010527).

Almost surely, 2^12505257 is an apocalyptic number.

It is an amenable number.

12505257 is a deficient number, since it is larger than the sum of its proper divisors (5557905).

12505257 is a wasteful number, since it uses less digits than its factorization.

12505257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389479 (or 1389476 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 12505257 is about 3536.2772798524. The cubic root of 12505257 is about 232.1119715641. Note that the first 3 decimals are identical.

Adding to 12505257 its reverse (75250521), we get a palindrome (87755778).

The spelling of 12505257 in words is "twelve million, five hundred five thousand, two hundred fifty-seven".