548721 has 8 divisors (see below), whose sum is σ = 812960. Its totient is φ = 365796.

The previous prime is 548719. The next prime is 548749. The reversal of 548721 is 127845.

It is not a de Polignac number, because 548721 - 2¹ = 548719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 20323 = 548721 / (5 + 4 + 8 + 7 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 548721.

It is not an unprimeable number, because it can be changed into a prime (548761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10135 + ... + 10188.

It is an arithmetic number, because the mean of its divisors is an integer number (101620).

2⁵⁴⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

548721 is a deficient number, since it is larger than the sum of its proper divisors (264239).

548721 is a wasteful number, since it uses less digits than its factorization.

548721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20332 (or 20326 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 548721 is about 740.7570451909. The cubic root of 548721 is about 81.8685679542.

The spelling of 548721 in words is "five hundred forty-eight thousand, seven hundred twenty-one".