51726809 has 2 divisors, whose sum is σ = 51726810. Its totient is φ = 51726808.

The previous prime is 51726803. The next prime is 51726821. The reversal of 51726809 is 90862715.

51726809 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., 38477209 + 13249600 = 6203^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 51726809 - 2²⁰ = 50678233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51726803) 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, 25863404 + 25863405.

It is an arithmetic number, because the mean of its divisors is an integer number (25863405).

Almost surely, 2^51726809 is an apocalyptic number.

It is an amenable number.

51726809 is a deficient number, since it is larger than the sum of its proper divisors (1).

51726809 is an equidigital number, since it uses as much as digits as its factorization.

51726809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 51726809 is about 7192.1352184174. The cubic root of 51726809 is about 372.5963212016.

The spelling of 51726809 in words is "fifty-one million, seven hundred twenty-six thousand, eight hundred nine".