51320450309 has 2 divisors, whose sum is σ = 51320450310. Its totient is φ = 51320450308.

The previous prime is 51320450189. The next prime is 51320450383. The reversal of 51320450309 is 90305402315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36845954209 + 14474496100 = 191953^2 + 120310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51320450309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51320450009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25660225154 + 25660225155.

It is an arithmetic number, because the mean of its divisors is an integer number (25660225155).

Almost surely, 2^51320450309 is an apocalyptic number.

It is an amenable number.

51320450309 is a deficient number, since it is larger than the sum of its proper divisors (1).

51320450309 is an equidigital number, since it uses as much as digits as its factorization.

51320450309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 51320450309 in words is "fifty-one billion, three hundred twenty million, four hundred fifty thousand, three hundred nine".