531315540 has 144 divisors (see below), whose sum is σ = 1848188160. Its totient is φ = 121029120.

The previous prime is 531315529. The next prime is 531315553. The reversal of 531315540 is 45513135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 514825 + ... + 515855.

It is an arithmetic number, because the mean of its divisors is an integer number (12834640).

Almost surely, 2^531315540 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 531315540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924094080).

531315540 is an abundant number, since it is smaller than the sum of its proper divisors (1316872620).

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

531315540 is a wasteful number, since it uses less digits than its factorization.

531315540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 531315540 is about 23050.2828616050. The cubic root of 531315540 is about 809.9362547000.

Adding to 531315540 its reverse (45513135), we get a palindrome (576828675).

The spelling of 531315540 in words is "five hundred thirty-one million, three hundred fifteen thousand, five hundred forty".