551560221 has 24 divisors (see below), whose sum is σ = 819504504. Its totient is φ = 357212160.

The previous prime is 551560199. The next prime is 551560237. The reversal of 551560221 is 122065155.

551560221 is a `hidden beast` number, since 5 + 51 + 5 + 602 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 67076100 + 484484121 = 8190^2 + 22011^2 .

It is not a de Polignac number, because 551560221 - 2⁹ = 551559709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551560271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 404581 + ... + 405941.

It is an arithmetic number, because the mean of its divisors is an integer number (34146021).

Almost surely, 2^551560221 is an apocalyptic number.

It is an amenable number.

551560221 is a deficient number, since it is larger than the sum of its proper divisors (267944283).

551560221 is a wasteful number, since it uses less digits than its factorization.

551560221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621 (or 2618 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 551560221 is about 23485.3192654475. The cubic root of 551560221 is about 820.0952799259.

The spelling of 551560221 in words is "five hundred fifty-one million, five hundred sixty thousand, two hundred twenty-one".