531500013 has 24 divisors (see below), whose sum is σ = 838244160. Its totient is φ = 321840960.

The previous prime is 531500003. The next prime is 531500041. The reversal of 531500013 is 310005135.

It is a happy number.

It is not a de Polignac number, because 531500013 - 2⁸ = 531499757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531500003) 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 23 ways as a sum of consecutive naturals, for example, 200545 + ... + 203177.

It is an arithmetic number, because the mean of its divisors is an integer number (34926840).

Almost surely, 2^531500013 is an apocalyptic number.

It is an amenable number.

531500013 is a deficient number, since it is larger than the sum of its proper divisors (306744147).

531500013 is a wasteful number, since it uses less digits than its factorization.

531500013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4689 (or 4686 counting only the distinct ones).

The product of its (nonzero) digits is 225, while the sum is 18.

The square root of 531500013 is about 23054.2840487403. The cubic root of 531500013 is about 810.0299806004.

Adding to 531500013 its reverse (310005135), we get a palindrome (841505148).

The spelling of 531500013 in words is "five hundred thirty-one million, five hundred thousand, thirteen".