50128139 has 2 divisors, whose sum is σ = 50128140. Its totient is φ = 50128138.

The previous prime is 50128103. The next prime is 50128157. The reversal of 50128139 is 93182105.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50128139 is a prime.

It is not a weakly prime, because it can be changed into another prime (50128159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25064069 + 25064070.

It is an arithmetic number, because the mean of its divisors is an integer number (25064070).

Almost surely, 2^50128139 is an apocalyptic number.

50128139 is a deficient number, since it is larger than the sum of its proper divisors (1).

50128139 is an equidigital number, since it uses as much as digits as its factorization.

50128139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 50128139 is about 7080.1228096693. The cubic root of 50128139 is about 368.7175934750.

The spelling of 50128139 in words is "fifty million, one hundred twenty-eight thousand, one hundred thirty-nine".