531243235340 has 24 divisors (see below), whose sum is σ = 1115624811840. Its totient is φ = 212494624128.

The previous prime is 531243235253. The next prime is 531243235351. The reversal of 531243235340 is 43532342135.

It is a self number, because there is not a number n which added to its sum of digits gives 531243235340.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2519096 + ... + 2721824.

It is an arithmetic number, because the mean of its divisors is an integer number (46484367160).

Almost surely, 2^531243235340 is an apocalyptic number.

It is an amenable number.

531243235340 is an abundant number, since it is smaller than the sum of its proper divisors (584381576500).

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

531243235340 is a wasteful number, since it uses less digits than its factorization.

531243235340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333761 (or 333759 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 35.

Adding to 531243235340 its reverse (43532342135), we get a palindrome (574775577475).

The spelling of 531243235340 in words is "five hundred thirty-one billion, two hundred forty-three million, two hundred thirty-five thousand, three hundred forty".