531821056 has 40 divisors (see below), whose sum is σ = 1144356444. Its totient is φ = 245452800.

The previous prime is 531821051. The next prime is 531821063. The reversal of 531821056 is 650128135.

It can be written as a sum of positive squares in 2 ways, for example, as 491065600 + 40755456 = 22160^2 + 6384^2 .

It is not an unprimeable number, because it can be changed into a prime (531821051) 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, 33295 + ... + 46606.

Almost surely, 2^531821056 is an apocalyptic number.

It is an amenable number.

531821056 is an abundant number, since it is smaller than the sum of its proper divisors (612535388).

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

531821056 is an equidigital number, since it uses as much as digits as its factorization.

531821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79932 (or 79916 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 531821056 is about 23061.2457599324. The cubic root of 531821056 is about 810.1930424417.

The spelling of 531821056 in words is "five hundred thirty-one million, eight hundred twenty-one thousand, fifty-six".