556641 has 12 divisors (see below), whose sum is σ = 812032. Its totient is φ = 367416.

The previous prime is 556639. The next prime is 556651. The reversal of 556641 is 146655.

It is a happy number.

556641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 556641 - 2¹ = 556639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 900 + ... + 1386.

2⁵⁵⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

556641 is a deficient number, since it is larger than the sum of its proper divisors (255391).

556641 is a wasteful number, since it uses less digits than its factorization.

556641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620 (or 617 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 556641 is about 746.0837754569. The cubic root of 556641 is about 82.2605730381.

The spelling of 556641 in words is "five hundred fifty-six thousand, six hundred forty-one".