51279887 has 2 divisors, whose sum is σ = 51279888. Its totient is φ = 51279886.

The previous prime is 51279881. The next prime is 51279911. The reversal of 51279887 is 78897215.

51279887 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 a de Polignac number, because none of the positive numbers 2^k-51279887 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51279881) 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, 25639943 + 25639944.

It is an arithmetic number, because the mean of its divisors is an integer number (25639944).

Almost surely, 2^51279887 is an apocalyptic number.

51279887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51279887 is an equidigital number, since it uses as much as digits as its factorization.

51279887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The square root of 51279887 is about 7160.9976260295. The cubic root of 51279887 is about 371.5201326893.

The spelling of 51279887 in words is "fifty-one million, two hundred seventy-nine thousand, eight hundred eighty-seven".