531315231212 has 24 divisors (see below), whose sum is σ = 930372549120. Its totient is φ = 265494566480.

The previous prime is 531315231133. The next prime is 531315231229. The reversal of 531315231212 is 212132513135.

It is a super-2 number, since 2×531315231212² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83550089 + ... + 83556447.

It is an arithmetic number, because the mean of its divisors is an integer number (38765522880).

Almost surely, 2^531315231212 is an apocalyptic number.

It is an amenable number.

531315231212 is a deficient number, since it is larger than the sum of its proper divisors (399057317908).

531315231212 is a wasteful number, since it uses less digits than its factorization.

531315231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15901 (or 15899 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

Adding to 531315231212 its reverse (212132513135), we get a palindrome (743447744347).

The spelling of 531315231212 in words is "five hundred thirty-one billion, three hundred fifteen million, two hundred thirty-one thousand, two hundred twelve".