51745139 has 2 divisors, whose sum is σ = 51745140. Its totient is φ = 51745138.

The previous prime is 51745123. The next prime is 51745153. The reversal of 51745139 is 93154715.

51745139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51745139 - 2⁴ = 51745123 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 51745099 and 51745108.

It is not a weakly prime, because it can be changed into another prime (51742139) 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, 25872569 + 25872570.

It is an arithmetic number, because the mean of its divisors is an integer number (25872570).

Almost surely, 2^51745139 is an apocalyptic number.

51745139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51745139 is an equidigital number, since it uses as much as digits as its factorization.

51745139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 35.

The square root of 51745139 is about 7193.4094141791. The cubic root of 51745139 is about 372.6403272927.

The spelling of 51745139 in words is "fifty-one million, seven hundred forty-five thousand, one hundred thirty-nine".