51138229 has 2 divisors, whose sum is σ = 51138230. Its totient is φ = 51138228.

The previous prime is 51138221. The next prime is 51138271. The reversal of 51138229 is 92283115.

51138229 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., 44863204 + 6275025 = 6698^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138229 - 2³ = 51138221 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51138229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51138221) 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, 25569114 + 25569115.

It is an arithmetic number, because the mean of its divisors is an integer number (25569115).

Almost surely, 2^51138229 is an apocalyptic number.

It is an amenable number.

51138229 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138229 is an equidigital number, since it uses as much as digits as its factorization.

51138229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The square root of 51138229 is about 7151.0998454783. The cubic root of 51138229 is about 371.1777155613.

The spelling of 51138229 in words is "fifty-one million, one hundred thirty-eight thousand, two hundred twenty-nine".