50139 has 10 divisors (see below), whose sum is σ = 75020. Its totient is φ = 33372.

The previous prime is 50131. The next prime is 50147. The reversal of 50139 is 93105.

It is an interprime number because it is at equal distance from previous prime (50131) and next prime (50147).

It is not a de Polignac number, because 50139 - 2³ = 50131 is a prime.

It is a Duffinian number.

50139 is a lucky number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (50131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 229 + ... + 390.

It is an arithmetic number, because the mean of its divisors is an integer number (7502).

2⁵⁰¹³⁹ is an apocalyptic number.

50139 is a deficient number, since it is larger than the sum of its proper divisors (24881).

50139 is an equidigital number, since it uses as much as digits as its factorization.

50139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 50139 is about 223.9173954832. The cubic root of 50139 is about 36.8744220919.

The spelling of 50139 in words is "fifty thousand, one hundred thirty-nine".