823147009 has 2 divisors, whose sum is σ = 823147010. Its totient is φ = 823147008.

The previous prime is 823147001. The next prime is 823147033. The reversal of 823147009 is 900741328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 820650609 + 2496400 = 28647^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 823147009 - 2³ = 823147001 is a prime.

It is not a weakly prime, because it can be changed into another prime (823147001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411573504 + 411573505.

It is an arithmetic number, because the mean of its divisors is an integer number (411573505).

Almost surely, 2^823147009 is an apocalyptic number.

It is an amenable number.

823147009 is a deficient number, since it is larger than the sum of its proper divisors (1).

823147009 is an equidigital number, since it uses as much as digits as its factorization.

823147009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 823147009 is about 28690.5386669543. The cubic root of 823147009 is about 937.1860197507.

The spelling of 823147009 in words is "eight hundred twenty-three million, one hundred forty-seven thousand, nine".