51011139727 has 4 divisors (see below), whose sum is σ = 51012902520. Its totient is φ = 51009376936.

The previous prime is 51011139643. The next prime is 51011139769. The reversal of 51011139727 is 72793111015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51011139727 - 2¹¹ = 51011137679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011139427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837253 + ... + 896110.

It is an arithmetic number, because the mean of its divisors is an integer number (12753225630).

Almost surely, 2^51011139727 is an apocalyptic number.

51011139727 is a deficient number, since it is larger than the sum of its proper divisors (1762793).

51011139727 is a wasteful number, since it uses less digits than its factorization.

51011139727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762792.

The product of its (nonzero) digits is 13230, while the sum is 37.

The spelling of 51011139727 in words is "fifty-one billion, eleven million, one hundred thirty-nine thousand, seven hundred twenty-seven".