51718873 has 2 divisors, whose sum is σ = 51718874. Its totient is φ = 51718872.

The previous prime is 51718871. The next prime is 51718903. The reversal of 51718873 is 37881715.

It is a happy number.

51718873 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., 51667344 + 51529 = 7188^2 + 227^2 .

It is a cyclic number.

It is not a de Polignac number, because 51718873 - 2¹ = 51718871 is a prime.

Together with 51718871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51718871) 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, 25859436 + 25859437.

It is an arithmetic number, because the mean of its divisors is an integer number (25859437).

Almost surely, 2^51718873 is an apocalyptic number.

It is an amenable number.

51718873 is a deficient number, since it is larger than the sum of its proper divisors (1).

51718873 is an equidigital number, since it uses as much as digits as its factorization.

51718873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 40.

The square root of 51718873 is about 7191.5834834896. The cubic root of 51718873 is about 372.5772654760.

The spelling of 51718873 in words is "fifty-one million, seven hundred eighteen thousand, eight hundred seventy-three".