547721 has 4 divisors (see below), whose sum is σ = 549444. Its totient is φ = 546000.

The previous prime is 547709. The next prime is 547727. The reversal of 547721 is 127745.

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 1600 + 546121 = 40^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 547721 - 2¹⁴ = 531337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 547721.

It is not an unprimeable number, because it can be changed into a prime (547727) 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, 230 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (137361).

2⁵⁴⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

547721 is a deficient number, since it is larger than the sum of its proper divisors (1723).

547721 is a wasteful number, since it uses less digits than its factorization.

547721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722.

The product of its digits is 1960, while the sum is 26.

The square root of 547721 is about 740.0817522409. The cubic root of 547721 is about 81.8188047465.

The spelling of 547721 in words is "five hundred forty-seven thousand, seven hundred twenty-one".