12551687 has 2 divisors, whose sum is σ = 12551688. Its totient is φ = 12551686.

The previous prime is 12551681. The next prime is 12551689. The reversal of 12551687 is 78615521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12551687 is a prime.

Together with 12551689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12551681) 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 as a sum of consecutive naturals, namely, 6275843 + 6275844.

It is an arithmetic number, because the mean of its divisors is an integer number (6275844).

Almost surely, 2^12551687 is an apocalyptic number.

12551687 is a deficient number, since it is larger than the sum of its proper divisors (1).

12551687 is an equidigital number, since it uses as much as digits as its factorization.

12551687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 12551687 is about 3542.8360108817. The cubic root of 12551687 is about 232.3988815301.

The spelling of 12551687 in words is "twelve million, five hundred fifty-one thousand, six hundred eighty-seven".