556649 has 4 divisors (see below), whose sum is σ = 558420. Its totient is φ = 554880.

The previous prime is 556639. The next prime is 556651. The reversal of 556649 is 946655.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 243049 = 560^2 + 493^2 .

It is a cyclic number.

It is not a de Polignac number, because 556649 - 2¹² = 552553 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272 + ... + 1089.

It is an arithmetic number, because the mean of its divisors is an integer number (139605).

2⁵⁵⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

556649 is a deficient number, since it is larger than the sum of its proper divisors (1771).

556649 is a wasteful number, since it uses less digits than its factorization.

556649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its digits is 32400, while the sum is 35.

The square root of 556649 is about 746.0891367658. The cubic root of 556649 is about 82.2609671170.

The spelling of 556649 in words is "five hundred fifty-six thousand, six hundred forty-nine".