51867917 has 2 divisors, whose sum is σ = 51867918. Its totient is φ = 51867916.

The previous prime is 51867889. The next prime is 51867947. The reversal of 51867917 is 71976815.

51867917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 23629321 = 5314^2 + 4861^2 .

It is a cyclic number.

It is not a de Polignac number, because 51867917 - 2⁸ = 51867661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51867947) 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, 25933958 + 25933959.

It is an arithmetic number, because the mean of its divisors is an integer number (25933959).

Almost surely, 2^51867917 is an apocalyptic number.

It is an amenable number.

51867917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51867917 is an equidigital number, since it uses as much as digits as its factorization.

51867917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 44.

The square root of 51867917 is about 7201.9384196201. The cubic root of 51867917 is about 372.9348212725.

The spelling of 51867917 in words is "fifty-one million, eight hundred sixty-seven thousand, nine hundred seventeen".