549804621 has 4 divisors (see below), whose sum is σ = 733072832. Its totient is φ = 366536412.

The previous prime is 549804601. The next prime is 549804641. The reversal of 549804621 is 126408945.

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 an interprime number because it is at equal distance from previous prime (549804601) and next prime (549804641).

It is not a de Polignac number, because 549804621 - 2⁶ = 549804557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 549804621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549804601) 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, 91634101 + ... + 91634106.

It is an arithmetic number, because the mean of its divisors is an integer number (183268208).

Almost surely, 2^549804621 is an apocalyptic number.

It is an amenable number.

549804621 is a deficient number, since it is larger than the sum of its proper divisors (183268211).

549804621 is a wasteful number, since it uses less digits than its factorization.

549804621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183268210.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 549804621 is about 23447.9129348435. The cubic root of 549804621 is about 819.2242420374.

The spelling of 549804621 in words is "five hundred forty-nine million, eight hundred four thousand, six hundred twenty-one".