556531 has 4 divisors (see below), whose sum is σ = 580752. Its totient is φ = 532312.

The previous prime is 556519. The next prime is 556537. The reversal of 556531 is 135655.

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

It is not a de Polignac number, because 556531 - 2⁷ = 556403 is a prime.

It is a super-2 number, since 2×556531² = 619453507922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 556496 and 556505.

It is not an unprimeable number, because it can be changed into a prime (556537) 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 3 ways as a sum of consecutive naturals, for example, 12076 + ... + 12121.

It is an arithmetic number, because the mean of its divisors is an integer number (145188).

2⁵⁵⁶⁵³¹ is an apocalyptic number.

556531 is a deficient number, since it is larger than the sum of its proper divisors (24221).

556531 is a wasteful number, since it uses less digits than its factorization.

556531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24220.

The product of its digits is 2250, while the sum is 25.

The square root of 556531 is about 746.0100535516. The cubic root of 556531 is about 82.2551540702.

The spelling of 556531 in words is "five hundred fifty-six thousand, five hundred thirty-one".