556431 has 4 divisors (see below), whose sum is σ = 741912. Its totient is φ = 370952.

The previous prime is 556403. The next prime is 556441. The reversal of 556431 is 134655.

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

It is a cyclic number.

It is not a de Polignac number, because 556431 - 2⁵ = 556399 is a prime.

It is a super-2 number, since 2×556431² = 619230915522, which contains 22 as substring.

It is a D-number.

556431 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556441) 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, 92736 + ... + 92741.

It is an arithmetic number, because the mean of its divisors is an integer number (185478).

2⁵⁵⁶⁴³¹ is an apocalyptic number.

556431 is a deficient number, since it is larger than the sum of its proper divisors (185481).

556431 is a wasteful number, since it uses less digits than its factorization.

556431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185480.

The product of its digits is 1800, while the sum is 24.

The square root of 556431 is about 745.9430273151. The cubic root of 556431 is about 82.2502271160.

The spelling of 556431 in words is "five hundred fifty-six thousand, four hundred thirty-one".