531871727689 has 6 divisors (see below), whose sum is σ = 564998686814. Its totient is φ = 500585155200.

The previous prime is 531871727671. The next prime is 531871727719. The reversal of 531871727689 is 986727178135.

It can be written as a sum of positive squares in 3 ways, for example, as 402314924089 + 129556803600 = 634283^2 + 359940^2 .

It is not a de Polignac number, because 531871727689 - 2³⁵ = 497511989321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531871727689.

It is not an unprimeable number, because it can be changed into a prime (531871724689) 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 5 ways as a sum of consecutive naturals, for example, 920193012 + ... + 920193589.

Almost surely, 2^531871727689 is an apocalyptic number.

It is an amenable number.

531871727689 is a deficient number, since it is larger than the sum of its proper divisors (33126959125).

531871727689 is a wasteful number, since it uses less digits than its factorization.

531871727689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840386635 (or 1840386618 counting only the distinct ones).

The product of its digits is 35562240, while the sum is 64.

The spelling of 531871727689 in words is "five hundred thirty-one billion, eight hundred seventy-one million, seven hundred twenty-seven thousand, six hundred eighty-nine".