531320521340 has 48 divisors (see below), whose sum is σ = 1275295852992. Its totient is φ = 182148950016.

The previous prime is 531320521327. The next prime is 531320521349. The reversal of 531320521340 is 43125023135.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531320521349) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1266764 + ... + 1633196.

It is an arithmetic number, because the mean of its divisors is an integer number (26568663604).

Almost surely, 2^531320521340 is an apocalyptic number.

It is an amenable number.

531320521340 is an abundant number, since it is smaller than the sum of its proper divisors (743975331652).

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

531320521340 is a wasteful number, since it uses less digits than its factorization.

531320521340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376806 (or 376804 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 531320521340 its reverse (43125023135), we get a palindrome (574445544475).

The spelling of 531320521340 in words is "five hundred thirty-one billion, three hundred twenty million, five hundred twenty-one thousand, three hundred forty".