531321321504 has 48 divisors (see below), whose sum is σ = 1394756260128. Its totient is φ = 177102308352.

The previous prime is 531321321473. The next prime is 531321321527. The reversal of 531321321504 is 405123123135.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6257059 + ... + 6341405.

It is an arithmetic number, because the mean of its divisors is an integer number (29057422086).

Almost surely, 2^531321321504 is an apocalyptic number.

It is an amenable number.

531321321504 is an abundant number, since it is smaller than the sum of its proper divisors (863434938624).

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

531321321504 is a wasteful number, since it uses less digits than its factorization.

531321321504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149977 (or 149969 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 531321321504 its reverse (405123123135), we get a palindrome (936444444639).

The spelling of 531321321504 in words is "five hundred thirty-one billion, three hundred twenty-one million, three hundred twenty-one thousand, five hundred four".