50139013 has 4 divisors (see below), whose sum is σ = 50206528. Its totient is φ = 50071500.

The previous prime is 50138969. The next prime is 50139029. The reversal of 50139013 is 31093105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31093105 = 5 ⋅6218621.

It is a cyclic number.

It is not a de Polignac number, because 50139013 - 2¹⁷ = 50007941 is a prime.

It is a super-2 number, since 2×50139013² = 5027841249228338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50139413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32631 + ... + 34132.

It is an arithmetic number, because the mean of its divisors is an integer number (12551632).

Almost surely, 2^50139013 is an apocalyptic number.

It is an amenable number.

50139013 is a deficient number, since it is larger than the sum of its proper divisors (67515).

50139013 is an equidigital number, since it uses as much as digits as its factorization.

50139013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67514.

The product of its (nonzero) digits is 405, while the sum is 22.

The square root of 50139013 is about 7080.8906925612. The cubic root of 50139013 is about 368.7442527880.

The spelling of 50139013 in words is "fifty million, one hundred thirty-nine thousand, thirteen".