531135520 has 24 divisors (see below), whose sum is σ = 1254808044. Its totient is φ = 212454144.

The previous prime is 531135511. The next prime is 531135533. The reversal of 531135520 is 25531135.

It can be written as a sum of positive squares in 2 ways, for example, as 465006096 + 66129424 = 21564^2 + 8132^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1659639 + ... + 1659958.

Almost surely, 2^531135520 is an apocalyptic number.

It is an amenable number.

531135520 is an abundant number, since it is smaller than the sum of its proper divisors (723672524).

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

531135520 is a wasteful number, since it uses less digits than its factorization.

531135520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319612 (or 3319604 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 531135520 is about 23046.3775895476. The cubic root of 531135520 is about 809.8447703347.

Adding to 531135520 its reverse (25531135), we get a palindrome (556666655).

The spelling of 531135520 in words is "five hundred thirty-one million, one hundred thirty-five thousand, five hundred twenty".