531321330 has 64 divisors (see below), whose sum is σ = 1309271040. Its totient is φ = 137919936.

The previous prime is 531321319. The next prime is 531321331. The reversal of 531321330 is 33123135.

It is a junction number, because it is equal to n+sod(n) for n = 531321297 and 531321306.

It is not an unprimeable number, because it can be changed into a prime (531321331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 540019 + ... + 541001.

It is an arithmetic number, because the mean of its divisors is an integer number (20457360).

Almost surely, 2^531321330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531321330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (654635520).

531321330 is an abundant number, since it is smaller than the sum of its proper divisors (777949710).

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

531321330 is a wasteful number, since it uses less digits than its factorization.

531321330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455.

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 531321330 is about 23050.4084562508. The cubic root of 531321330 is about 809.9391967771.

Adding to 531321330 its reverse (33123135), we get a palindrome (564444465).

The spelling of 531321330 in words is "five hundred thirty-one million, three hundred twenty-one thousand, three hundred thirty".