556324321 has 16 divisors (see below), whose sum is σ = 643638528. Its totient is φ = 470995200.

The previous prime is 556324309. The next prime is 556324369. The reversal of 556324321 is 123423655.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 556324321 - 2¹³ = 556316129 is a prime.

It is a super-2 number, since 2×556324321² = 618993500272222082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556324421) 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, 374901 + ... + 376381.

It is an arithmetic number, because the mean of its divisors is an integer number (40227408).

Almost surely, 2^556324321 is an apocalyptic number.

It is an amenable number.

556324321 is a deficient number, since it is larger than the sum of its proper divisors (87314207).

556324321 is a wasteful number, since it uses less digits than its factorization.

556324321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its digits is 21600, while the sum is 31.

The square root of 556324321 is about 23586.5283795645. The cubic root of 556324321 is about 822.4497043983.

Adding to 556324321 its reverse (123423655), we get a palindrome (679747976).

The spelling of 556324321 in words is "five hundred fifty-six million, three hundred twenty-four thousand, three hundred twenty-one".