9281768921 has 2 divisors, whose sum is σ = 9281768922. Its totient is φ = 9281768920.

The previous prime is 9281768891. The next prime is 9281768941. The reversal of 9281768921 is 1298671829.

9281768921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9281395600 + 373321 = 96340^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 9281768921 - 2¹⁰ = 9281767897 is a prime.

It is not a weakly prime, because it can be changed into another prime (9281768941) 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 as a sum of consecutive naturals, namely, 4640884460 + 4640884461.

It is an arithmetic number, because the mean of its divisors is an integer number (4640884461).

Almost surely, 2^9281768921 is an apocalyptic number.

It is an amenable number.

9281768921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9281768921 is an equidigital number, since it uses as much as digits as its factorization.

9281768921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 9281768921 is about 96341.9374986823. The cubic root of 9281768921 is about 2101.5686632428.

The spelling of 9281768921 in words is "nine billion, two hundred eighty-one million, seven hundred sixty-eight thousand, nine hundred twenty-one".