531243243440 has 80 divisors (see below), whose sum is σ = 1520172994368. Its totient is φ = 168129727488.

The previous prime is 531243243397. The next prime is 531243243467. The reversal of 531243243440 is 44342342135.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×531243243440² (a number of 24 digits) contains 22 as substring.

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 531243243440.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36479207 + ... + 36493766.

Almost surely, 2^531243243440 is an apocalyptic number.

It is an amenable number.

531243243440 is an abundant number, since it is smaller than the sum of its proper divisors (988929750928).

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

531243243440 is a wasteful number, since it uses less digits than its factorization.

531243243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72973006 (or 72973000 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 35.

Adding to 531243243440 its reverse (44342342135), we get a palindrome (575585585575).

The spelling of 531243243440 in words is "five hundred thirty-one billion, two hundred forty-three million, two hundred forty-three thousand, four hundred forty".