531216330 has 32 divisors (see below), whose sum is σ = 1277394624. Its totient is φ = 141382656.

The previous prime is 531216319. The next prime is 531216409. The reversal of 531216330 is 33612135.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 531216330.

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, 1239 + ... + 32618.

It is an arithmetic number, because the mean of its divisors is an integer number (39918582).

Almost surely, 2^531216330 is an apocalyptic number.

531216330 is an abundant number, since it is smaller than the sum of its proper divisors (746178294).

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

531216330 is a wasteful number, since it uses less digits than its factorization.

531216330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34390.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 531216330 is about 23048.1307268073. The cubic root of 531216330 is about 809.8858397258.

Adding to 531216330 its reverse (33612135), we get a palindrome (564828465).

The spelling of 531216330 in words is "five hundred thirty-one million, two hundred sixteen thousand, three hundred thirty".