51688073 has 2 divisors, whose sum is σ = 51688074. Its totient is φ = 51688072.

The previous prime is 51688057. The next prime is 51688093. The reversal of 51688073 is 37088615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50865424 + 822649 = 7132^2 + 907^2 .

It is a cyclic number.

It is not a de Polignac number, because 51688073 - 2⁴ = 51688057 is a prime.

It is not a weakly prime, because it can be changed into another prime (51688033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25844036 + 25844037.

It is an arithmetic number, because the mean of its divisors is an integer number (25844037).

Almost surely, 2^51688073 is an apocalyptic number.

It is an amenable number.

51688073 is a deficient number, since it is larger than the sum of its proper divisors (1).

51688073 is an equidigital number, since it uses as much as digits as its factorization.

51688073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 51688073 is about 7189.4417724883. The cubic root of 51688073 is about 372.5032908137.

The spelling of 51688073 in words is "fifty-one million, six hundred eighty-eight thousand, seventy-three".