531323113231 has 4 divisors (see below), whose sum is σ = 540033328264. Its totient is φ = 522612898200.

The previous prime is 531323113219. The next prime is 531323113241. The reversal of 531323113231 is 132311323135.

It is a happy number.

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 531323113231 - 2⁵ = 531323113199 is a prime.

It is a super-2 number, since 2×531323113231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531323113231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531323113241) 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, 4355107425 + ... + 4355107546.

It is an arithmetic number, because the mean of its divisors is an integer number (135008332066).

Almost surely, 2^531323113231 is an apocalyptic number.

531323113231 is a deficient number, since it is larger than the sum of its proper divisors (8710215033).

531323113231 is an equidigital number, since it uses as much as digits as its factorization.

531323113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710215032.

The product of its digits is 4860, while the sum is 28.

Adding to 531323113231 its reverse (132311323135), we get a palindrome (663634436366).

The spelling of 531323113231 in words is "five hundred thirty-one billion, three hundred twenty-three million, one hundred thirteen thousand, two hundred thirty-one".