551227221 has 64 divisors (see below), whose sum is σ = 894124800. Its totient is φ = 334430208.

The previous prime is 551227217. The next prime is 551227231. The reversal of 551227221 is 122722155.

551227221 is a `hidden beast` number, since 551 + 22 + 72 + 21 = 666.

551227221 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 551227221 - 2² = 551227217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551227231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2144725 + ... + 2144981.

It is an arithmetic number, because the mean of its divisors is an integer number (13970700).

Almost surely, 2^551227221 is an apocalyptic number.

It is an amenable number.

551227221 is a deficient number, since it is larger than the sum of its proper divisors (342897579).

551227221 is a wasteful number, since it uses less digits than its factorization.

551227221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 429 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 551227221 is about 23478.2286597605. The cubic root of 551227221 is about 819.9302047475.

Adding to 551227221 its reverse (122722155), we get a palindrome (673949376).

The spelling of 551227221 in words is "five hundred fifty-one million, two hundred twenty-seven thousand, two hundred twenty-one".