51543422009 has 2 divisors, whose sum is σ = 51543422010. Its totient is φ = 51543422008.

The previous prime is 51543421957. The next prime is 51543422089. The reversal of 51543422009 is 90022434515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49171732009 + 2371690000 = 221747^2 + 48700^2 .

It is a cyclic number.

It is not a de Polignac number, because 51543422009 - 2⁸ = 51543421753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51543422009.

It is not a weakly prime, because it can be changed into another prime (51543422089) 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, 25771711004 + 25771711005.

It is an arithmetic number, because the mean of its divisors is an integer number (25771711005).

Almost surely, 2^51543422009 is an apocalyptic number.

It is an amenable number.

51543422009 is a deficient number, since it is larger than the sum of its proper divisors (1).

51543422009 is an equidigital number, since it uses as much as digits as its factorization.

51543422009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 51543422009 in words is "fifty-one billion, five hundred forty-three million, four hundred twenty-two thousand, nine".