51338939 has 2 divisors, whose sum is σ = 51338940. Its totient is φ = 51338938.

The previous prime is 51338897. The next prime is 51338953. The reversal of 51338939 is 93983315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51338939 - 2¹⁶ = 51273403 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 51338896 and 51338905.

It is not a weakly prime, because it can be changed into another prime (51338999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25669469 + 25669470.

It is an arithmetic number, because the mean of its divisors is an integer number (25669470).

Almost surely, 2^51338939 is an apocalyptic number.

51338939 is a deficient number, since it is larger than the sum of its proper divisors (1).

51338939 is an equidigital number, since it uses as much as digits as its factorization.

51338939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 41.

The square root of 51338939 is about 7165.1196082131. The cubic root of 51338939 is about 371.6626875464.

The spelling of 51338939 in words is "fifty-one million, three hundred thirty-eight thousand, nine hundred thirty-nine".