823634849 has 2 divisors, whose sum is σ = 823634850. Its totient is φ = 823634848.

The previous prime is 823634839. The next prime is 823634863. The reversal of 823634849 is 948436328.

823634849 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., 806162449 + 17472400 = 28393^2 + 4180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-823634849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (823634809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411817424 + 411817425.

It is an arithmetic number, because the mean of its divisors is an integer number (411817425).

Almost surely, 2^823634849 is an apocalyptic number.

It is an amenable number.

823634849 is a deficient number, since it is larger than the sum of its proper divisors (1).

823634849 is an equidigital number, since it uses as much as digits as its factorization.

823634849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 47.

The square root of 823634849 is about 28699.0391651010. The cubic root of 823634849 is about 937.3711250167.

The spelling of 823634849 in words is "eight hundred twenty-three million, six hundred thirty-four thousand, eight hundred forty-nine".