9691971841 has 4 divisors (see below), whose sum is σ = 9692188884. Its totient is φ = 9691754800.

The previous prime is 9691971833. The next prime is 9691971901. The reversal of 9691971841 is 1481791969.

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 5317472241 + 4374499600 = 72921^2 + 66140^2 .

It is a cyclic number.

It is not a de Polignac number, because 9691971841 - 2³ = 9691971833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9691972841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14230 + ... + 139951.

It is an arithmetic number, because the mean of its divisors is an integer number (2423047221).

Almost surely, 2^9691971841 is an apocalyptic number.

It is an amenable number.

9691971841 is a deficient number, since it is larger than the sum of its proper divisors (217043).

9691971841 is a wasteful number, since it uses less digits than its factorization.

9691971841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217042.

The product of its digits is 979776, while the sum is 55.

The square root of 9691971841 is about 98447.8127791573. The cubic root of 9691971841 is about 2132.0827080339.

The spelling of 9691971841 in words is "nine billion, six hundred ninety-one million, nine hundred seventy-one thousand, eight hundred forty-one".