551345220 has 72 divisors (see below), whose sum is σ = 1703998296. Its totient is φ = 144248832.

The previous prime is 551345161. The next prime is 551345231. The reversal of 551345220 is 22543155.

It is a happy number.

551345220 is a `hidden beast` number, since 5 + 5 + 134 + 522 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 157402116 + 393943104 = 12546^2 + 19848^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 19357 + ... + 38436.

It is an arithmetic number, because the mean of its divisors is an integer number (23666643).

Almost surely, 2^551345220 is an apocalyptic number.

It is an amenable number.

551345220 is an abundant number, since it is smaller than the sum of its proper divisors (1152653076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551345220 is a wasteful number, since it uses less digits than its factorization.

551345220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57861 (or 57856 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 551345220 is about 23480.7414704051. The cubic root of 551345220 is about 819.9887069633.

Adding to 551345220 its reverse (22543155), we get a palindrome (573888375).

The spelling of 551345220 in words is "five hundred fifty-one million, three hundred forty-five thousand, two hundred twenty".