531531 has 48 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 250560.

The previous prime is 531521. The next prime is 531547. The reversal of 531531 is 135135.

It is a happy number.

It is not a de Polignac number, because 531531 - 2¹⁰ = 530507 is a prime.

It is a super-2 number, since 2×531531² = 565050407922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (531521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8980 + ... + 9038.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2⁵³¹⁵³¹ is an apocalyptic number.

531531 is a deficient number, since it is larger than the sum of its proper divisors (516789).

531531 is a wasteful number, since it uses less digits than its factorization.

531531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96 (or 93 counting only the distinct ones).

The product of its digits is 225, while the sum is 18.

The square root of 531531 is about 729.0617257818. The cubic root of 531531 is about 81.0045722156.

Adding to 531531 its reverse (135135), we get a palindrome (666666).

The spelling of 531531 in words is "five hundred thirty-one thousand, five hundred thirty-one".