531618 has 16 divisors (see below), whose sum is σ = 1070496. Its totient is φ = 176000.

The previous prime is 531613. The next prime is 531623. The reversal of 531618 is 816135.

It is an interprime number because it is at equal distance from previous prime (531613) and next prime (531623).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (531611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1330 + ... + 1682.

It is an arithmetic number, because the mean of its divisors is an integer number (66906).

2⁵³¹⁶¹⁸ is an apocalyptic number.

531618 is an abundant number, since it is smaller than the sum of its proper divisors (538878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531618 is a wasteful number, since it uses less digits than its factorization.

531618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609.

The product of its digits is 720, while the sum is 24.

The square root of 531618 is about 729.1213890704. The cubic root of 531618 is about 81.0089915335.

The spelling of 531618 in words is "five hundred thirty-one thousand, six hundred eighteen".