51032809 has 2 divisors, whose sum is σ = 51032810. Its totient is φ = 51032808.

The previous prime is 51032749. The next prime is 51032887. The reversal of 51032809 is 90823015.

51032809 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., 40043584 + 10989225 = 6328^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 51032809 - 2⁹ = 51032297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51032609) 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, 25516404 + 25516405.

It is an arithmetic number, because the mean of its divisors is an integer number (25516405).

Almost surely, 2^51032809 is an apocalyptic number.

It is an amenable number.

51032809 is a deficient number, since it is larger than the sum of its proper divisors (1).

51032809 is an equidigital number, since it uses as much as digits as its factorization.

51032809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51032809 is about 7143.7251486882. The cubic root of 51032809 is about 370.9224826724.

The spelling of 51032809 in words is "fifty-one million, thirty-two thousand, eight hundred nine".