531213240 has 32 divisors (see below), whose sum is σ = 1593640080. Its totient is φ = 141656832.

The previous prime is 531213233. The next prime is 531213257. The reversal of 531213240 is 42312135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213269 + ... + 2213508.

Almost surely, 2^531213240 is an apocalyptic number.

It is an amenable number.

531213240 is an abundant number, since it is smaller than the sum of its proper divisors (1062426840).

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

531213240 is a wasteful number, since it uses less digits than its factorization.

531213240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426791 (or 4426787 counting only the distinct ones).

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

The square root of 531213240 is about 23048.0636930741. The cubic root of 531213240 is about 809.8842693975.

Adding to 531213240 its reverse (42312135), we get a palindrome (573525375).

The spelling of 531213240 in words is "five hundred thirty-one million, two hundred thirteen thousand, two hundred forty".