844541609 has 2 divisors, whose sum is σ = 844541610. Its totient is φ = 844541608.

The previous prime is 844541597. The next prime is 844541617. The reversal of 844541609 is 906145448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512026384 + 332515225 = 22628^2 + 18235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-844541609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (844541309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422270804 + 422270805.

It is an arithmetic number, because the mean of its divisors is an integer number (422270805).

Almost surely, 2^844541609 is an apocalyptic number.

It is an amenable number.

844541609 is a deficient number, since it is larger than the sum of its proper divisors (1).

844541609 is an equidigital number, since it uses as much as digits as its factorization.

844541609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 844541609 is about 29060.9980730188. The cubic root of 844541609 is about 945.2362105603.

The spelling of 844541609 in words is "eight hundred forty-four million, five hundred forty-one thousand, six hundred nine".