531243075640 has 64 divisors (see below), whose sum is σ = 1212400949760. Its totient is φ = 209457843840.

The previous prime is 531243075613. The next prime is 531243075641. The reversal of 531243075640 is 46570342135.

It is a happy number.

It is a super-2 number, since 2×531243075640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 531243075593 and 531243075602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531243075641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14599309 + ... + 14635651.

It is an arithmetic number, because the mean of its divisors is an integer number (18943764840).

Almost surely, 2^531243075640 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 531243075640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606200474880).

531243075640 is an abundant number, since it is smaller than the sum of its proper divisors (681157874120).

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

531243075640 is a wasteful number, since it uses less digits than its factorization.

531243075640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41572 (or 41568 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 531243075640 in words is "five hundred thirty-one billion, two hundred forty-three million, seventy-five thousand, six hundred forty".