549644639 has 16 divisors (see below), whose sum is σ = 580260864. Its totient is φ = 519631200.

The previous prime is 549644621. The next prime is 549644653. The reversal of 549644639 is 936446945.

549644639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 549644639 - 2¹² = 549640543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549644339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1015709 + ... + 1016249.

It is an arithmetic number, because the mean of its divisors is an integer number (36266304).

Almost surely, 2^549644639 is an apocalyptic number.

549644639 is a deficient number, since it is larger than the sum of its proper divisors (30616225).

549644639 is a wasteful number, since it uses less digits than its factorization.

549644639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its digits is 2799360, while the sum is 50.

The square root of 549644639 is about 23444.5012529591. The cubic root of 549644639 is about 819.1447751130.

The spelling of 549644639 in words is "five hundred forty-nine million, six hundred forty-four thousand, six hundred thirty-nine".