551530221 has 24 divisors (see below), whose sum is σ = 811329792. Its totient is φ = 333009600.

The previous prime is 551530211. The next prime is 551530247. The reversal of 551530221 is 122035155.

It is a happy number.

It is not a de Polignac number, because 551530221 - 2⁷ = 551530093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 551530191 and 551530200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551530211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99300 + ... + 104706.

It is an arithmetic number, because the mean of its divisors is an integer number (33805408).

Almost surely, 2^551530221 is an apocalyptic number.

It is an amenable number.

551530221 is a deficient number, since it is larger than the sum of its proper divisors (259799571).

551530221 is a wasteful number, since it uses less digits than its factorization.

551530221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5713 (or 5702 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 551530221 is about 23484.6805598884. The cubic root of 551530221 is about 820.0804110119.

Adding to 551530221 its reverse (122035155), we get a palindrome (673565376).

The spelling of 551530221 in words is "five hundred fifty-one million, five hundred thirty thousand, two hundred twenty-one".