531318820 has 24 divisors (see below), whose sum is σ = 1131057144. Its totient is φ = 209615616.

The previous prime is 531318817. The next prime is 531318841. The reversal of 531318820 is 28813135.

It can be written as a sum of positive squares in 4 ways, for example, as 200704 + 531118116 = 448^2 + 23046^2 .

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, 180499 + ... + 183418.

It is an arithmetic number, because the mean of its divisors is an integer number (47127381).

Almost surely, 2^531318820 is an apocalyptic number.

It is an amenable number.

531318820 is an abundant number, since it is smaller than the sum of its proper divisors (599738324).

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

531318820 is a wasteful number, since it uses less digits than its factorization.

531318820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363999 (or 363997 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 531318820 is about 23050.3540102967. The cubic root of 531318820 is about 809.9379213715.

The spelling of 531318820 in words is "five hundred thirty-one million, three hundred eighteen thousand, eight hundred twenty".