556731 has 12 divisors (see below), whose sum is σ = 919152. Its totient is φ = 318096.

The previous prime is 556727. The next prime is 556741. The reversal of 556731 is 137655.

It is not a de Polignac number, because 556731 - 2² = 556727 is a prime.

It is a super-2 number, since 2×556731² = 619898812722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 556695 and 556704.

It is not an unprimeable number, because it can be changed into a prime (556741) 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 11 ways as a sum of consecutive naturals, for example, 4356 + ... + 4481.

It is an arithmetic number, because the mean of its divisors is an integer number (76596).

2⁵⁵⁶⁷³¹ is an apocalyptic number.

556731 is a deficient number, since it is larger than the sum of its proper divisors (362421).

556731 is a wasteful number, since it uses less digits than its factorization.

556731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8850 (or 8847 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 556731 is about 746.1440879616. The cubic root of 556731 is about 82.2650062081.

It can be divided in two parts, 55 and 6731, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 556731 in words is "five hundred fifty-six thousand, seven hundred thirty-one".