9789121 has 2 divisors, whose sum is σ = 9789122. Its totient is φ = 9789120.

The previous prime is 9789083. The next prime is 9789133. The reversal of 9789121 is 1219879.

9789121 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., 9090225 + 698896 = 3015^2 + 836^2 .

It is an emirp because it is prime and its reverse (1219879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9789121 - 2¹⁷ = 9658049 is a prime.

It is not a weakly prime, because it can be changed into another prime (9759121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4894560 + 4894561.

It is an arithmetic number, because the mean of its divisors is an integer number (4894561).

Almost surely, 2^9789121 is an apocalyptic number.

It is an amenable number.

9789121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9789121 is an equidigital number, since it uses as much as digits as its factorization.

9789121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 37.

The square root of 9789121 is about 3128.7571014702. The cubic root of 9789121 is about 213.9182804409.

The spelling of 9789121 in words is "nine million, seven hundred eighty-nine thousand, one hundred twenty-one".