51681871 has 2 divisors, whose sum is σ = 51681872. Its totient is φ = 51681870.

The previous prime is 51681863. The next prime is 51681893. The reversal of 51681871 is 17818615.

51681871 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 is a cyclic number.

It is not a de Polignac number, because 51681871 - 2³ = 51681863 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51681871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51681841) 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, 25840935 + 25840936.

It is an arithmetic number, because the mean of its divisors is an integer number (25840936).

Almost surely, 2^51681871 is an apocalyptic number.

51681871 is a deficient number, since it is larger than the sum of its proper divisors (1).

51681871 is an equidigital number, since it uses as much as digits as its factorization.

51681871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 37.

The square root of 51681871 is about 7189.0104325978. The cubic root of 51681871 is about 372.4883914524.

The spelling of 51681871 in words is "fifty-one million, six hundred eighty-one thousand, eight hundred seventy-one".