51075809 has 2 divisors, whose sum is σ = 51075810. Its totient is φ = 51075808.

The previous prime is 51075797. The next prime is 51075811. The reversal of 51075809 is 90857015.

51075809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 25472209 = 5060^2 + 5047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51075809 is a prime.

Together with 51075811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51075839) 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, 25537904 + 25537905.

It is an arithmetic number, because the mean of its divisors is an integer number (25537905).

Almost surely, 2^51075809 is an apocalyptic number.

It is an amenable number.

51075809 is a deficient number, since it is larger than the sum of its proper divisors (1).

51075809 is an equidigital number, since it uses as much as digits as its factorization.

51075809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 51075809 is about 7146.7341492461. The cubic root of 51075809 is about 371.0266325938.

The spelling of 51075809 in words is "fifty-one million, seventy-five thousand, eight hundred nine".