841628209 has 2 divisors, whose sum is σ = 841628210. Its totient is φ = 841628208.

The previous prime is 841628189. The next prime is 841628297. The reversal of 841628209 is 902826148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 543029809 + 298598400 = 23303^2 + 17280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-841628209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (841628309) 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, 420814104 + 420814105.

It is an arithmetic number, because the mean of its divisors is an integer number (420814105).

Almost surely, 2^841628209 is an apocalyptic number.

It is an amenable number.

841628209 is a deficient number, since it is larger than the sum of its proper divisors (1).

841628209 is an equidigital number, since it uses as much as digits as its factorization.

841628209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 841628209 is about 29010.8291677436. The cubic root of 841628209 is about 944.1480368630.

The spelling of 841628209 in words is "eight hundred forty-one million, six hundred twenty-eight thousand, two hundred nine".