323138813209 has 3 divisors (see below), whose sum is σ = 323139381663. Its totient is φ = 323138244756.

The previous prime is 323138813201. The next prime is 323138813251. The reversal of 323138813209 is 902318831323.

The square root of 323138813209 is 568453.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 319863769225 + 3275043984 = 565565^2 + 57228^2 .

It is not a de Polignac number, because 323138813209 - 2³ = 323138813201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (323138813201) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 284227 + ... + 852679.

It is an arithmetic number, because the mean of its divisors is an integer number (107713127221).

Almost surely, 2^323138813209 is an apocalyptic number.

323138813209 is the 568453-rd square number.

323138813209 is the 284227-th centered octagonal number.

It is an amenable number.

323138813209 is a deficient number, since it is larger than the sum of its proper divisors (568454).

323138813209 is an frugal number, since it uses more digits than its factorization.

323138813209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136906 (or 568453 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 323138813209 in words is "three hundred twenty-three billion, one hundred thirty-eight million, eight hundred thirteen thousand, two hundred nine".