12987851 has 4 divisors (see below), whose sum is σ = 13338912. Its totient is φ = 12636792.

The previous prime is 12987841. The next prime is 12987869. The reversal of 12987851 is 15878921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12987851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12987799 and 12987808.

It is not an unprimeable number, because it can be changed into a prime (12987841) 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 3 ways as a sum of consecutive naturals, for example, 175475 + ... + 175548.

It is an arithmetic number, because the mean of its divisors is an integer number (3334728).

Almost surely, 2^12987851 is an apocalyptic number.

12987851 is a deficient number, since it is larger than the sum of its proper divisors (351061).

12987851 is an equidigital number, since it uses as much as digits as its factorization.

12987851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351060.

The product of its digits is 40320, while the sum is 41.

The square root of 12987851 is about 3603.8661184900. The cubic root of 12987851 is about 235.0601988528.

The spelling of 12987851 in words is "twelve million, nine hundred eighty-seven thousand, eight hundred fifty-one".