531561240 has 192 divisors, whose sum is σ = 2028087360. Its totient is φ = 118195200.

The previous prime is 531561197. The next prime is 531561241. The reversal of 531561240 is 42165135.

531561240 is a `hidden beast` number, since 5 + 3 + 1 + 5 + 612 + 40 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531561241) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 90390 + ... + 96090.

It is an arithmetic number, because the mean of its divisors is an integer number (10562955).

Almost surely, 2^531561240 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 531561240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014043680).

531561240 is an abundant number, since it is smaller than the sum of its proper divisors (1496526120).

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

531561240 is a wasteful number, since it uses less digits than its factorization.

531561240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5762 (or 5755 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 531561240 is about 23055.6118981909. The cubic root of 531561240 is about 810.0610836422.

The spelling of 531561240 in words is "five hundred thirty-one million, five hundred sixty-one thousand, two hundred forty".