51250139 has 2 divisors, whose sum is σ = 51250140. Its totient is φ = 51250138.

The previous prime is 51250117. The next prime is 51250151. The reversal of 51250139 is 93105215.

51250139 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 a de Polignac number, because none of the positive numbers 2^k-51250139 is a prime.

It is not a weakly prime, because it can be changed into another prime (51250159) 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, 25625069 + 25625070.

It is an arithmetic number, because the mean of its divisors is an integer number (25625070).

Almost surely, 2^51250139 is an apocalyptic number.

51250139 is a deficient number, since it is larger than the sum of its proper divisors (1).

51250139 is an equidigital number, since it uses as much as digits as its factorization.

51250139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 26.

The square root of 51250139 is about 7158.9202398127. The cubic root of 51250139 is about 371.4482778851.

The spelling of 51250139 in words is "fifty-one million, two hundred fifty thousand, one hundred thirty-nine".