12518281 has 4 divisors (see below), whose sum is σ = 12554500. Its totient is φ = 12482064.

The previous prime is 12518267. The next prime is 12518287. The reversal of 12518281 is 18281521.

12518281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 2175625 = 3216^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 12518281 - 2²¹ = 10421129 is a prime.

It is a super-2 number, since 2×12518281² = 313414718389922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12518287) 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, 17586 + ... + 18283.

It is an arithmetic number, because the mean of its divisors is an integer number (3138625).

Almost surely, 2^12518281 is an apocalyptic number.

It is an amenable number.

12518281 is a deficient number, since it is larger than the sum of its proper divisors (36219).

12518281 is an equidigital number, since it uses as much as digits as its factorization.

12518281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36218.

The product of its digits is 1280, while the sum is 28.

The square root of 12518281 is about 3538.1182851906. The cubic root of 12518281 is about 232.1925237524.

The spelling of 12518281 in words is "twelve million, five hundred eighteen thousand, two hundred eighty-one".