531220326 has 64 divisors (see below), whose sum is σ = 1311292416. Its totient is φ = 139708800.

The previous prime is 531220321. The next prime is 531220363. The reversal of 531220326 is 623022135.

It is a junction number, because it is equal to n+sod(n) for n = 531220296 and 531220305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531220321) 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, 228711 + ... + 231021.

It is an arithmetic number, because the mean of its divisors is an integer number (20488944).

Almost surely, 2^531220326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531220326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (655646208).

531220326 is an abundant number, since it is smaller than the sum of its proper divisors (780072090).

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

531220326 is a wasteful number, since it uses less digits than its factorization.

531220326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 531220326 is about 23048.2174148024. The cubic root of 531220326 is about 809.8878704714.

The spelling of 531220326 in words is "five hundred thirty-one million, two hundred twenty thousand, three hundred twenty-six".