549930821 has 8 divisors (see below), whose sum is σ = 601975584. Its totient is φ = 498227920.

The previous prime is 549930811. The next prime is 549930847. The reversal of 549930821 is 128039945.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 549930821 - 2⁶ = 549930757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549930811) 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 7 ways as a sum of consecutive naturals, for example, 82091 + ... + 88536.

It is an arithmetic number, because the mean of its divisors is an integer number (75246948).

Almost surely, 2^549930821 is an apocalyptic number.

It is an amenable number.

549930821 is a deficient number, since it is larger than the sum of its proper divisors (52044763).

549930821 is a wasteful number, since it uses less digits than its factorization.

549930821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170931.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 549930821 is about 23450.6038515003. The cubic root of 549930821 is about 819.2869177505.

The spelling of 549930821 in words is "five hundred forty-nine million, nine hundred thirty thousand, eight hundred twenty-one".