51306523139 has 2 divisors, whose sum is σ = 51306523140. Its totient is φ = 51306523138.

The previous prime is 51306523109. The next prime is 51306523181. The reversal of 51306523139 is 93132560315.

51306523139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51306523139 is a prime.

It is a super-2 number, since 2×51306523139² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51306523109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25653261569 + 25653261570.

It is an arithmetic number, because the mean of its divisors is an integer number (25653261570).

Almost surely, 2^51306523139 is an apocalyptic number.

51306523139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51306523139 is an equidigital number, since it uses as much as digits as its factorization.

51306523139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 38.

The spelling of 51306523139 in words is "fifty-one billion, three hundred six million, five hundred twenty-three thousand, one hundred thirty-nine".