531645930 has 80 divisors (see below), whose sum is σ = 1513666440. Its totient is φ = 133429248.

The previous prime is 531645929. The next prime is 531645971. The reversal of 531645930 is 39546135.

531645930 is a `hidden beast` number, since 5 + 3 + 1 + 64 + 593 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 440118441 + 91527489 = 20979^2 + 9567^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5535 + ... + 33074.

Almost surely, 2^531645930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531645930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756833220).

531645930 is an abundant number, since it is smaller than the sum of its proper divisors (982020510).

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

531645930 is a wasteful number, since it uses less digits than its factorization.

531645930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38645 (or 38636 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 531645930 is about 23057.4484711557. The cubic root of 531645930 is about 810.1041018465.

The spelling of 531645930 in words is "five hundred thirty-one million, six hundred forty-five thousand, nine hundred thirty".