549333021 has 4 divisors (see below), whose sum is σ = 732444032. Its totient is φ = 366222012.

The previous prime is 549333013. The next prime is 549333049. The reversal of 549333021 is 120333945.

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.

It is not a de Polignac number, because 549333021 - 2³ = 549333013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 549333021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549333061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91555501 + ... + 91555506.

It is an arithmetic number, because the mean of its divisors is an integer number (183111008).

Almost surely, 2^549333021 is an apocalyptic number.

It is an amenable number.

549333021 is a deficient number, since it is larger than the sum of its proper divisors (183111011).

549333021 is a wasteful number, since it uses less digits than its factorization.

549333021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183111010.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 549333021 is about 23437.8544453199. The cubic root of 549333021 is about 818.9899426430.

Adding to 549333021 its reverse (120333945), we get a palindrome (669666966).

The spelling of 549333021 in words is "five hundred forty-nine million, three hundred thirty-three thousand, twenty-one".