9319999121 has 2 divisors, whose sum is σ = 9319999122. Its totient is φ = 9319999120.

The previous prime is 9319999109. The next prime is 9319999163. The reversal of 9319999121 is 1219999139.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8104500625 + 1215498496 = 90025^2 + 34864^2 .

It is a cyclic number.

It is not a de Polignac number, because 9319999121 - 2⁶ = 9319999057 is a prime.

It is not a weakly prime, because it can be changed into another prime (9319999721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4659999560 + 4659999561.

It is an arithmetic number, because the mean of its divisors is an integer number (4659999561).

Almost surely, 2^9319999121 is an apocalyptic number.

It is an amenable number.

9319999121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9319999121 is an equidigital number, since it uses as much as digits as its factorization.

9319999121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 354294, while the sum is 53.

The square root of 9319999121 is about 96540.1425366671. The cubic root of 9319999121 is about 2104.4500584917.

The spelling of 9319999121 in words is "nine billion, three hundred nineteen million, nine hundred ninety-nine thousand, one hundred twenty-one".