9691681729 has 4 divisors (see below), whose sum is σ = 9693143380. Its totient is φ = 9690220080.

The previous prime is 9691681711. The next prime is 9691681739. The reversal of 9691681729 is 9271861969.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5097960000 + 4593721729 = 71400^2 + 67777^2 .

It is a cyclic number.

It is not a de Polignac number, because 9691681729 - 2⁹ = 9691681217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9691681739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720834 + ... + 734155.

It is an arithmetic number, because the mean of its divisors is an integer number (2423285845).

Almost surely, 2^9691681729 is an apocalyptic number.

It is an amenable number.

9691681729 is a deficient number, since it is larger than the sum of its proper divisors (1461651).

9691681729 is a wasteful number, since it uses less digits than its factorization.

9691681729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461650.

The product of its digits is 2939328, while the sum is 58.

The square root of 9691681729 is about 98446.3393377326. The cubic root of 9691681729 is about 2132.0614344492.

The spelling of 9691681729 in words is "nine billion, six hundred ninety-one million, six hundred eighty-one thousand, seven hundred twenty-nine".