531312240 has 80 divisors (see below), whose sum is σ = 1649894400. Its totient is φ = 141440256.

The previous prime is 531312239. The next prime is 531312251. The reversal of 531312240 is 42213135.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171021 + ... + 174099.

It is an arithmetic number, because the mean of its divisors is an integer number (20623680).

Almost surely, 2^531312240 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 531312240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824947200).

531312240 is an abundant number, since it is smaller than the sum of its proper divisors (1118582160).

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

531312240 is a wasteful number, since it uses less digits than its factorization.

531312240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814 (or 3808 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 531312240 is about 23050.2112788582. The cubic root of 531312240 is about 809.9345778589.

Adding to 531312240 its reverse (42213135), we get a palindrome (573525375).

The spelling of 531312240 in words is "five hundred thirty-one million, three hundred twelve thousand, two hundred forty".