531145240 has 32 divisors (see below), whose sum is σ = 1196460000. Its totient is φ = 212212224.

The previous prime is 531145213. The next prime is 531145243. The reversal of 531145240 is 42541135.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531145243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29536 + ... + 43984.

It is an arithmetic number, because the mean of its divisors is an integer number (37389375).

Almost surely, 2^531145240 is an apocalyptic number.

It is an amenable number.

531145240 is an abundant number, since it is smaller than the sum of its proper divisors (665314760).

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

531145240 is a wasteful number, since it uses less digits than its factorization.

531145240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15379 (or 15375 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 531145240 is about 23046.5884677104. The cubic root of 531145240 is about 809.8497104695.

Adding to 531145240 its reverse (42541135), we get a palindrome (573686375).

The spelling of 531145240 in words is "five hundred thirty-one million, one hundred forty-five thousand, two hundred forty".