531521240 has 32 divisors (see below), whose sum is σ = 1196970480. Its totient is φ = 212422272.

The previous prime is 531521227. The next prime is 531521273. The reversal of 531521240 is 42125135.

It is a super-2 number, since 2×531521240² = 565029657142275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46142 + ... + 56498.

Almost surely, 2^531521240 is an apocalyptic number.

It is an amenable number.

531521240 is an abundant number, since it is smaller than the sum of its proper divisors (665449240).

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

531521240 is a wasteful number, since it uses less digits than its factorization.

531521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11651 (or 11647 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 531521240 is about 23054.7444141114. The cubic root of 531521240 is about 810.0407640918.

Adding to 531521240 its reverse (42125135), we get a palindrome (573646375).

The spelling of 531521240 in words is "five hundred thirty-one million, five hundred twenty-one thousand, two hundred forty".