9521972689 has 2 divisors, whose sum is σ = 9521972690. Its totient is φ = 9521972688.

The previous prime is 9521972687. The next prime is 9521972809. The reversal of 9521972689 is 9862791259.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7214803600 + 2307169089 = 84940^2 + 48033^2 .

It is a cyclic number.

It is not a de Polignac number, because 9521972689 - 2¹ = 9521972687 is a prime.

Together with 9521972687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9521972687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4760986344 + 4760986345.

It is an arithmetic number, because the mean of its divisors is an integer number (4760986345).

Almost surely, 2^9521972689 is an apocalyptic number.

It is an amenable number.

9521972689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9521972689 is an equidigital number, since it uses as much as digits as its factorization.

9521972689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 58.

The square root of 9521972689 is about 97580.5958631120. The cubic root of 9521972689 is about 2119.5433845860.

The spelling of 9521972689 in words is "nine billion, five hundred twenty-one million, nine hundred seventy-two thousand, six hundred eighty-nine".