531640812 has 12 divisors (see below), whose sum is σ = 1240495256. Its totient is φ = 177213600.

The previous prime is 531640763. The next prime is 531640819. The reversal of 531640812 is 218046135.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 531640812.

It is not an unprimeable number, because it can be changed into a prime (531640819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22151689 + ... + 22151712.

Almost surely, 2^531640812 is an apocalyptic number.

It is an amenable number.

531640812 is an abundant number, since it is smaller than the sum of its proper divisors (708854444).

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

531640812 is a wasteful number, since it uses less digits than its factorization.

531640812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44303408 (or 44303406 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 531640812 is about 23057.3374872295. The cubic root of 531640812 is about 810.1015022930.

Adding to 531640812 its reverse (218046135), we get a palindrome (749686947).

The spelling of 531640812 in words is "five hundred thirty-one million, six hundred forty thousand, eight hundred twelve".