556637 has 4 divisors (see below), whose sum is σ = 559260. Its totient is φ = 554016.

The previous prime is 556627. The next prime is 556639. The reversal of 556637 is 736655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 736655 = 5 ⋅147331.

It can be written as a sum of positive squares in 2 ways, for example, as 119716 + 436921 = 346^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 556637 - 2⁶ = 556573 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 556637.

It is not an unprimeable number, because it can be changed into a prime (556639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (139815).

2⁵⁵⁶⁶³⁷ is an apocalyptic number.

It is an amenable number.

556637 is a deficient number, since it is larger than the sum of its proper divisors (2623).

556637 is a wasteful number, since it uses less digits than its factorization.

556637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622.

The product of its digits is 18900, while the sum is 32.

The square root of 556637 is about 746.0810947880. The cubic root of 556637 is about 82.2603759972.

The spelling of 556637 in words is "five hundred fifty-six thousand, six hundred thirty-seven".