531645216 has 96 divisors (see below), whose sum is σ = 1485993600. Its totient is φ = 165851136.

The previous prime is 531645209. The next prime is 531645221. The reversal of 531645216 is 612546135.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323950 + ... + 325586.

It is an arithmetic number, because the mean of its divisors is an integer number (15479100).

Almost surely, 2^531645216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531645216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742996800).

531645216 is an abundant number, since it is smaller than the sum of its proper divisors (954348384).

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

531645216 is a wasteful number, since it uses less digits than its factorization.

531645216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866 (or 1858 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 531645216 is about 23057.4329880843. The cubic root of 531645216 is about 810.1037391900.

The spelling of 531645216 in words is "five hundred thirty-one million, six hundred forty-five thousand, two hundred sixteen".