51291038717 has 2 divisors, whose sum is σ = 51291038718. Its totient is φ = 51291038716.

The previous prime is 51291038713. The next prime is 51291038753. The reversal of 51291038717 is 71783019215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50343691876 + 947346841 = 224374^2 + 30779^2 .

It is a cyclic number.

It is not a de Polignac number, because 51291038717 - 2² = 51291038713 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51291038713) 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, 25645519358 + 25645519359.

It is an arithmetic number, because the mean of its divisors is an integer number (25645519359).

Almost surely, 2^51291038717 is an apocalyptic number.

It is an amenable number.

51291038717 is a deficient number, since it is larger than the sum of its proper divisors (1).

51291038717 is an equidigital number, since it uses as much as digits as its factorization.

51291038717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 51291038717 in words is "fifty-one billion, two hundred ninety-one million, thirty-eight thousand, seven hundred seventeen".