551032221 has 16 divisors (see below), whose sum is σ = 741861504. Its totient is φ = 363792384.

The previous prime is 551032213. The next prime is 551032249. The reversal of 551032221 is 122230155.

It is not a de Polignac number, because 551032221 - 2³ = 551032213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551032201) 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 15 ways as a sum of consecutive naturals, for example, 198781 + ... + 201533.

It is an arithmetic number, because the mean of its divisors is an integer number (46366344).

Almost surely, 2^551032221 is an apocalyptic number.

It is an amenable number.

551032221 is a deficient number, since it is larger than the sum of its proper divisors (190829283).

551032221 is a wasteful number, since it uses less digits than its factorization.

551032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 551032221 is about 23474.0755089524. The cubic root of 551032221 is about 819.8335082365.

Adding to 551032221 its reverse (122230155), we get a palindrome (673262376).

The spelling of 551032221 in words is "five hundred fifty-one million, thirty-two thousand, two hundred twenty-one".