8961209 has 2 divisors, whose sum is σ = 8961210. Its totient is φ = 8961208.

The previous prime is 8961149. The next prime is 8961221. The reversal of 8961209 is 9021698.

8961209 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., 7812025 + 1149184 = 2795^2 + 1072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8961209 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8961269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4480604 + 4480605.

It is an arithmetic number, because the mean of its divisors is an integer number (4480605).

Almost surely, 2^8961209 is an apocalyptic number.

It is an amenable number.

8961209 is a deficient number, since it is larger than the sum of its proper divisors (1).

8961209 is an equidigital number, since it uses as much as digits as its factorization.

8961209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 8961209 is about 2993.5278518831. The cubic root of 8961209 is about 207.7091055071.

The spelling of 8961209 in words is "eight million, nine hundred sixty-one thousand, two hundred nine".