549836721 has 32 divisors (see below), whose sum is σ = 938311680. Its totient is φ = 311704848.

The previous prime is 549836719. The next prime is 549836741. The reversal of 549836721 is 127638945.

549836721 is a `hidden beast` number, since 549 + 8 + 36 + 72 + 1 = 666.

549836721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 549836721 - 2¹ = 549836719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (549836711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12550 + ... + 35456.

It is an arithmetic number, because the mean of its divisors is an integer number (29322240).

Almost surely, 2^549836721 is an apocalyptic number.

It is an amenable number.

549836721 is a deficient number, since it is larger than the sum of its proper divisors (388474959).

549836721 is a wasteful number, since it uses less digits than its factorization.

549836721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23050 (or 23044 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 549836721 is about 23448.5974207414. The cubic root of 549836721 is about 819.2401850260.

The spelling of 549836721 in words is "five hundred forty-nine million, eight hundred thirty-six thousand, seven hundred twenty-one".