556521 has 8 divisors (see below), whose sum is σ = 848064. Its totient is φ = 318000.

The previous prime is 556519. The next prime is 556537. The reversal of 556521 is 125655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 556521 - 2¹ = 556519 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 556491 and 556500.

It is not an unprimeable number, because it can be changed into a prime (556021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13230 + ... + 13271.

It is an arithmetic number, because the mean of its divisors is an integer number (106008).

2⁵⁵⁶⁵²¹ is an apocalyptic number.

It is an amenable number.

556521 is a deficient number, since it is larger than the sum of its proper divisors (291543).

556521 is a wasteful number, since it uses less digits than its factorization.

556521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26511.

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

The square root of 556521 is about 746.0033511989. The cubic root of 556521 is about 82.2546614013.

The spelling of 556521 in words is "five hundred fifty-six thousand, five hundred twenty-one".