823423109 has 2 divisors, whose sum is σ = 823423110. Its totient is φ = 823423108.

The previous prime is 823423103. The next prime is 823423157. The reversal of 823423109 is 901324328.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599172484 + 224250625 = 24478^2 + 14975^2 .

It is a cyclic number.

It is not a de Polignac number, because 823423109 - 2²⁰ = 822374533 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823423103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411711554 + 411711555.

It is an arithmetic number, because the mean of its divisors is an integer number (411711555).

Almost surely, 2^823423109 is an apocalyptic number.

It is an amenable number.

823423109 is a deficient number, since it is larger than the sum of its proper divisors (1).

823423109 is an equidigital number, since it uses as much as digits as its factorization.

823423109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 823423109 is about 28695.3499543044. The cubic root of 823423109 is about 937.2907916938.

The spelling of 823423109 in words is "eight hundred twenty-three million, four hundred twenty-three thousand, one hundred nine".