531421240 has 64 divisors (see below), whose sum is σ = 1370208960. Its totient is φ = 181708800.

The previous prime is 531421237. The next prime is 531421243. The reversal of 531421240 is 42124135.

It is an interprime number because it is at equal distance from previous prime (531421237) and next prime (531421243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531421243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109914 + ... + 114646.

It is an arithmetic number, because the mean of its divisors is an integer number (21409515).

Almost surely, 2^531421240 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 531421240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685104480).

531421240 is an abundant number, since it is smaller than the sum of its proper divisors (838787720).

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

531421240 is a wasteful number, since it uses less digits than its factorization.

531421240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152 (or 5148 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 531421240 is about 23052.5755610951. The cubic root of 531421240 is about 809.9899607555.

Adding to 531421240 its reverse (42124135), we get a palindrome (573545375).

The spelling of 531421240 in words is "five hundred thirty-one million, four hundred twenty-one thousand, two hundred forty".