51393212617 has 2 divisors, whose sum is σ = 51393212618. Its totient is φ = 51393212616.

The previous prime is 51393212573. The next prime is 51393212653. The reversal of 51393212617 is 71621239315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51197660361 + 195552256 = 226269^2 + 13984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51393212617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51393212617.

It is not a weakly prime, because it can be changed into another prime (51399212617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25696606308 + 25696606309.

It is an arithmetic number, because the mean of its divisors is an integer number (25696606309).

Almost surely, 2^51393212617 is an apocalyptic number.

It is an amenable number.

51393212617 is a deficient number, since it is larger than the sum of its proper divisors (1).

51393212617 is an equidigital number, since it uses as much as digits as its factorization.

51393212617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The spelling of 51393212617 in words is "fifty-one billion, three hundred ninety-three million, two hundred twelve thousand, six hundred seventeen".