841365209 has 2 divisors, whose sum is σ = 841365210. Its totient is φ = 841365208.

The previous prime is 841365199. The next prime is 841365229. The reversal of 841365209 is 902563148.

It is a happy number.

841365209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809971600 + 31393609 = 28460^2 + 5603^2 .

It is a cyclic number.

It is not a de Polignac number, because 841365209 - 2¹² = 841361113 is a prime.

It is a super-2 number, since 2×841365209² = 1415790829831227362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (841365229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420682604 + 420682605.

It is an arithmetic number, because the mean of its divisors is an integer number (420682605).

Almost surely, 2^841365209 is an apocalyptic number.

It is an amenable number.

841365209 is a deficient number, since it is larger than the sum of its proper divisors (1).

841365209 is an equidigital number, since it uses as much as digits as its factorization.

841365209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 841365209 is about 29006.2960234498. The cubic root of 841365209 is about 944.0496811597.

The spelling of 841365209 in words is "eight hundred forty-one million, three hundred sixty-five thousand, two hundred nine".