51138469 has 2 divisors, whose sum is σ = 51138470. Its totient is φ = 51138468.

The previous prime is 51138467. The next prime is 51138539. The reversal of 51138469 is 96483115.

51138469 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., 47789569 + 3348900 = 6913^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 51138469 - 2¹ = 51138467 is a prime.

It is a super-2 number, since 2×51138469² = 5230286023327922, which contains 22 as substring.

Together with 51138467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51138463) 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, 25569234 + 25569235.

It is an arithmetic number, because the mean of its divisors is an integer number (25569235).

Almost surely, 2^51138469 is an apocalyptic number.

It is an amenable number.

51138469 is a deficient number, since it is larger than the sum of its proper divisors (1).

51138469 is an equidigital number, since it uses as much as digits as its factorization.

51138469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 51138469 is about 7151.1166260941. The cubic root of 51138469 is about 371.1782962261.

The spelling of 51138469 in words is "fifty-one million, one hundred thirty-eight thousand, four hundred sixty-nine".