8709121 has 2 divisors, whose sum is σ = 8709122. Its totient is φ = 8709120.

The previous prime is 8709079. The next prime is 8709133. The reversal of 8709121 is 1219078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5856400 + 2852721 = 2420^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 8709121 - 2¹⁷ = 8578049 is a prime.

It is a Chen prime.

8709121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8709121.

It is not a weakly prime, because it can be changed into another prime (8709191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4354560 + 4354561.

It is an arithmetic number, because the mean of its divisors is an integer number (4354561).

Almost surely, 2^8709121 is an apocalyptic number.

It is an amenable number.

8709121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8709121 is an equidigital number, since it uses as much as digits as its factorization.

8709121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 8709121 is about 2951.1219900235. The cubic root of 8709121 is about 205.7428610501.

The spelling of 8709121 in words is "eight million, seven hundred nine thousand, one hundred twenty-one".