50009 has 4 divisors (see below), whose sum is σ = 51216. Its totient is φ = 48804.

The previous prime is 49999. The next prime is 50021. The reversal of 50009 is 90005.

50009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 50009 - 2⁴ = 49993 is a prime.

It is a Duffinian number.

50009 is a modest number, since divided by 9 gives 5 as remainder.

It is a Curzon number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 49975 and 50002.

It is not an unprimeable number, because it can be changed into a prime (50069) 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, 539 + ... + 624.

It is an arithmetic number, because the mean of its divisors is an integer number (12804).

2⁵⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

50009 is a deficient number, since it is larger than the sum of its proper divisors (1207).

50009 is a wasteful number, since it uses less digits than its factorization.

50009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 50009 is about 223.6269214563. The cubic root of 50009 is about 36.8425252727.

The spelling of 50009 in words is "fifty thousand, nine".