9521989889 has 2 divisors, whose sum is σ = 9521989890. Its totient is φ = 9521989888.

The previous prime is 9521989793. The next prime is 9521989907. The reversal of 9521989889 is 9889891259.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8023680625 + 1498309264 = 89575^2 + 38708^2 .

It is a cyclic number.

It is not a de Polignac number, because 9521989889 - 2²⁸ = 9253554433 is a prime.

It is not a weakly prime, because it can be changed into another prime (9521919889) 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 as a sum of consecutive naturals, namely, 4760994944 + 4760994945.

It is an arithmetic number, because the mean of its divisors is an integer number (4760994945).

Almost surely, 2^9521989889 is an apocalyptic number.

It is an amenable number.

9521989889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9521989889 is an equidigital number, since it uses as much as digits as its factorization.

9521989889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33592320, while the sum is 68.

The square root of 9521989889 is about 97580.6839953482. The cubic root of 9521989889 is about 2119.5446607965.

The spelling of 9521989889 in words is "nine billion, five hundred twenty-one million, nine hundred eighty-nine thousand, eight hundred eighty-nine".