513323865531 has 12 divisors (see below), whose sum is σ = 757243717152. Its totient is φ = 334934720496.

The previous prime is 513323865503. The next prime is 513323865533. The reversal of 513323865531 is 135568323315.

513323865531 is a `hidden beast` number, since 5 + 1 + 3 + 32 + 3 + 86 + 5 + 531 = 666.

It is not a de Polignac number, because 513323865531 - 2⁵ = 513323865499 is a prime.

It is a super-2 number, since 2×513323865531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (513323865533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 606765376 + ... + 606766221.

It is an arithmetic number, because the mean of its divisors is an integer number (63103643096).

Almost surely, 2^513323865531 is an apocalyptic number.

513323865531 is a deficient number, since it is larger than the sum of its proper divisors (243919851621).

513323865531 is a wasteful number, since it uses less digits than its factorization.

513323865531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213531650 (or 1213531647 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The spelling of 513323865531 in words is "five hundred thirteen billion, three hundred twenty-three million, eight hundred sixty-five thousand, five hundred thirty-one".