54809 has 4 divisors (see below), whose sum is σ = 57216. Its totient is φ = 52404.

The previous prime is 54799. The next prime is 54829. The reversal of 54809 is 90845.

54809 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 an emirpimes, since its reverse is a distinct semiprime: 90845 = 5 ⋅18169.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 54809.

It is not an unprimeable number, because it can be changed into a prime (54829) 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, 1169 + ... + 1214.

It is an arithmetic number, because the mean of its divisors is an integer number (14304).

2⁵⁴⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

54809 is a deficient number, since it is larger than the sum of its proper divisors (2407).

54809 is a wasteful number, since it uses less digits than its factorization.

54809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 54809 is about 234.1132204725. The cubic root of 54809 is about 37.9854514944.

The spelling of 54809 in words is "fifty-four thousand, eight hundred nine".