12851687 has 4 divisors (see below), whose sum is σ = 13410480. Its totient is φ = 12292896.

The previous prime is 12851681. The next prime is 12851717. The reversal of 12851687 is 78615821.

12851687 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 is a cyclic number.

It is not a de Polignac number, because 12851687 - 2¹⁸ = 12589543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12851687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12851681) 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, 279362 + ... + 279407.

It is an arithmetic number, because the mean of its divisors is an integer number (3352620).

Almost surely, 2^12851687 is an apocalyptic number.

12851687 is a deficient number, since it is larger than the sum of its proper divisors (558793).

12851687 is an equidigital number, since it uses as much as digits as its factorization.

12851687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558792.

The product of its digits is 26880, while the sum is 38.

The square root of 12851687 is about 3584.9249643472. The cubic root of 12851687 is about 234.2358580813.

It can be divided in two parts, 128 and 51687, that added together give a palindrome (51815).

The spelling of 12851687 in words is "twelve million, eight hundred fifty-one thousand, six hundred eighty-seven".