51138277 has 2 divisors, whose sum is σ = 51138278. Its totient is φ = 51138276.

The previous prime is 51138271. The next prime is 51138287. The reversal of 51138277 is 77283115.

51138277 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 can be written as a sum of positive squares in only one way, i.e., 40373316 + 10764961 = 6354^2 + 3281^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138277 - 2¹⁹ = 50613989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51138271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569138 + 25569139.

It is an arithmetic number, because the mean of its divisors is an integer number (25569139).

Almost surely, 2^51138277 is an apocalyptic number.

It is an amenable number.

51138277 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138277 is an equidigital number, since it uses as much as digits as its factorization.

51138277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 51138277 is about 7151.1032016046. The cubic root of 51138277 is about 371.1778316944.

It can be divided in two parts, 51138 and 277, that added together give a palindrome (51415).

The spelling of 51138277 in words is "fifty-one million, one hundred thirty-eight thousand, two hundred seventy-seven".