823306109 has 4 divisors (see below), whose sum is σ = 823381500. Its totient is φ = 823230720.

The previous prime is 823306093. The next prime is 823306111. The reversal of 823306109 is 901603328.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 478646884 + 344659225 = 21878^2 + 18565^2 .

It is a cyclic number.

It is not a de Polignac number, because 823306109 - 2⁴ = 823306093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823306139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17822 + ... + 44319.

It is an arithmetic number, because the mean of its divisors is an integer number (205845375).

Almost surely, 2^823306109 is an apocalyptic number.

It is an amenable number.

823306109 is a deficient number, since it is larger than the sum of its proper divisors (75391).

823306109 is a wasteful number, since it uses less digits than its factorization.

823306109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75390.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 823306109 is about 28693.3112240466. The cubic root of 823306109 is about 937.2463964467.

The spelling of 823306109 in words is "eight hundred twenty-three million, three hundred six thousand, one hundred nine".