51809129 has 2 divisors, whose sum is σ = 51809130. Its totient is φ = 51809128.

The previous prime is 51809111. The next prime is 51809137. The reversal of 51809129 is 92190815.

51809129 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., 34810000 + 16999129 = 5900^2 + 4123^2 .

It is a cyclic number.

It is not a de Polignac number, because 51809129 - 2²⁰ = 50760553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51809629) 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, 25904564 + 25904565.

It is an arithmetic number, because the mean of its divisors is an integer number (25904565).

Almost surely, 2^51809129 is an apocalyptic number.

It is an amenable number.

51809129 is a deficient number, since it is larger than the sum of its proper divisors (1).

51809129 is an equidigital number, since it uses as much as digits as its factorization.

51809129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 51809129 is about 7197.8558612965. The cubic root of 51809129 is about 372.7938710679.

The spelling of 51809129 in words is "fifty-one million, eight hundred nine thousand, one hundred twenty-nine".