531512234540 has 72 divisors (see below), whose sum is σ = 1298532527712. Its totient is φ = 182215353600.

The previous prime is 531512234521. The next prime is 531512234549. The reversal of 531512234540 is 45432215135.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 531512234540.

It is not an unprimeable number, because it can be changed into a prime (531512234549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14241344 + ... + 14278616.

It is an arithmetic number, because the mean of its divisors is an integer number (18035173996).

Almost surely, 2^531512234540 is an apocalyptic number.

It is an amenable number.

531512234540 is an abundant number, since it is smaller than the sum of its proper divisors (767020293172).

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

531512234540 is a wasteful number, since it uses less digits than its factorization.

531512234540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51847 (or 51838 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 531512234540 its reverse (45432215135), we get a palindrome (576944449675).

The spelling of 531512234540 in words is "five hundred thirty-one billion, five hundred twelve million, two hundred thirty-four thousand, five hundred forty".