51809500433 has 2 divisors, whose sum is σ = 51809500434. Its totient is φ = 51809500432.

The previous prime is 51809500397. The next prime is 51809500511. The reversal of 51809500433 is 33400590815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49921858624 + 1887641809 = 223432^2 + 43447^2 .

It is a cyclic number.

It is not a de Polignac number, because 51809500433 - 2³² = 47514533137 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 (51809200433) 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, 25904750216 + 25904750217.

It is an arithmetic number, because the mean of its divisors is an integer number (25904750217).

Almost surely, 2^51809500433 is an apocalyptic number.

It is an amenable number.

51809500433 is a deficient number, since it is larger than the sum of its proper divisors (1).

51809500433 is an equidigital number, since it uses as much as digits as its factorization.

51809500433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 51809500433 in words is "fifty-one billion, eight hundred nine million, five hundred thousand, four hundred thirty-three".