549658221 has 16 divisors (see below), whose sum is σ = 848179200. Its totient is φ = 310113648.

The previous prime is 549658217. The next prime is 549658231. The reversal of 549658221 is 122856945.

It is not a de Polignac number, because 549658221 - 2² = 549658217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549658231) 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, 164001 + ... + 167318.

It is an arithmetic number, because the mean of its divisors is an integer number (53011200).

Almost surely, 2^549658221 is an apocalyptic number.

It is an amenable number.

549658221 is a deficient number, since it is larger than the sum of its proper divisors (298520979).

549658221 is a wasteful number, since it uses less digits than its factorization.

549658221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331408.

The product of its digits is 172800, while the sum is 42.

The square root of 549658221 is about 23444.7909139749. The cubic root of 549658221 is about 819.1515222194.

The spelling of 549658221 in words is "five hundred forty-nine million, six hundred fifty-eight thousand, two hundred twenty-one".