531531231 has 32 divisors (see below), whose sum is σ = 935566848. Its totient is φ = 259875840.

The previous prime is 531531211. The next prime is 531531241. The reversal of 531531231 is 132135135.

It is not a de Polignac number, because 531531231 - 2¹¹ = 531529183 is a prime.

It is a super-2 number, since 2×531531231² = 565050899056750722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531531211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63750 + ... + 71603.

It is an arithmetic number, because the mean of its divisors is an integer number (29236464).

Almost surely, 2^531531231 is an apocalyptic number.

531531231 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

531531231 is a deficient number, since it is larger than the sum of its proper divisors (404035617).

531531231 is a wasteful number, since it uses less digits than its factorization.

531531231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135391.

The product of its digits is 1350, while the sum is 24.

The square root of 531531231 is about 23054.9610930056. The cubic root of 531531231 is about 810.0458395030.

Adding to 531531231 its reverse (132135135), we get a palindrome (663666366).

The spelling of 531531231 in words is "five hundred thirty-one million, five hundred thirty-one thousand, two hundred thirty-one".