51507091717 has 2 divisors, whose sum is σ = 51507091718. Its totient is φ = 51507091716.

The previous prime is 51507091679. The next prime is 51507091751. The reversal of 51507091717 is 71719070515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51474988161 + 32103556 = 226881^2 + 5666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51507091717 is a prime.

It is a super-3 number, since 3×51507091717³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51507091417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25753545858 + 25753545859.

It is an arithmetic number, because the mean of its divisors is an integer number (25753545859).

Almost surely, 2^51507091717 is an apocalyptic number.

It is an amenable number.

51507091717 is a deficient number, since it is larger than the sum of its proper divisors (1).

51507091717 is an equidigital number, since it uses as much as digits as its factorization.

51507091717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77175, while the sum is 43.

The spelling of 51507091717 in words is "fifty-one billion, five hundred seven million, ninety-one thousand, seven hundred seventeen".