50509 has 4 divisors (see below), whose sum is σ = 51516. Its totient is φ = 49504.

The previous prime is 50503. The next prime is 50513. The reversal of 50509 is 90505.

50509 = T₁₈₂ + T₁₈₃ + T₁₈₄.

50509 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.

It can be written as a sum of positive squares in 2 ways, for example, as 28900 + 21609 = 170^2 + 147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50509 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 14.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50503) 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, 424 + ... + 529.

It is an arithmetic number, because the mean of its divisors is an integer number (12879).

2⁵⁰⁵⁰⁹ is an apocalyptic number.

50509 is the 184-th centered triangular number.

It is an amenable number.

50509 is a deficient number, since it is larger than the sum of its proper divisors (1007).

50509 is an equidigital number, since it uses as much as digits as its factorization.

50509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 50509 is about 224.7420743875. The cubic root of 50509 is about 36.9649046326.

The spelling of 50509 in words is "fifty thousand, five hundred nine".