54209 has 4 divisors (see below), whose sum is σ = 54720. Its totient is φ = 53700.

The previous prime is 54193. The next prime is 54217. The reversal of 54209 is 90245.

54209 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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90245 = 5 ⋅18049.

It is a cyclic number.

It is not a de Polignac number, because 54209 - 2⁴ = 54193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54269) 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, 29 + ... + 330.

It is an arithmetic number, because the mean of its divisors is an integer number (13680).

2⁵⁴²⁰⁹ is an apocalyptic number.

It is an amenable number.

54209 is a deficient number, since it is larger than the sum of its proper divisors (511).

54209 is a wasteful number, since it uses less digits than its factorization.

54209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 54209 is about 232.8282628892. The cubic root of 54209 is about 37.8463323317.

The spelling of 54209 in words is "fifty-four thousand, two hundred nine".