51139715293 has 2 divisors, whose sum is σ = 51139715294. Its totient is φ = 51139715292.

The previous prime is 51139715269. The next prime is 51139715359. The reversal of 51139715293 is 39251793115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50950872729 + 188842564 = 225723^2 + 13742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51139715293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51139715213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569857646 + 25569857647.

It is an arithmetic number, because the mean of its divisors is an integer number (25569857647).

Almost surely, 2^51139715293 is an apocalyptic number.

It is an amenable number.

51139715293 is a deficient number, since it is larger than the sum of its proper divisors (1).

51139715293 is an equidigital number, since it uses as much as digits as its factorization.

51139715293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 255150, while the sum is 46.

The spelling of 51139715293 in words is "fifty-one billion, one hundred thirty-nine million, seven hundred fifteen thousand, two hundred ninety-three".