9931214812689 has 27 divisors (see below), whose sum is σ = 14704075829937. Its totient is φ = 6459074596800.

The previous prime is 9931214812639. The next prime is 9931214812703. The reversal of 9931214812689 is 9862184121399.

The square root of 9931214812689 is 3151383.

It is a perfect power (a square), and thus also a powerful number.

9931214812689 is a `hidden beast` number, since 9 + 9 + 3 + 121 + 481 + 26 + 8 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6220120796289 + 3711094016400 = 2494017^2 + 1926420^2 .

It is not a de Polignac number, because 9931214812689 - 2¹¹ = 9931214810641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9931214812639) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 387607299 + ... + 387632919.

Almost surely, 2^{9931214812689} is an apocalyptic number.

9931214812689 is the 3151383-rd square number.

9931214812689 is the 1575692-nd centered octagonal number.

It is an amenable number.

9931214812689 is a deficient number, since it is larger than the sum of its proper divisors (4772861017248).

9931214812689 is an frugal number, since it uses more digits than its factorization.

9931214812689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51330 (or 25665 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The spelling of 9931214812689 in words is "nine trillion, nine hundred thirty-one billion, two hundred fourteen million, eight hundred twelve thousand, six hundred eighty-nine".