183438320209 has 3 divisors (see below), whose sum is σ = 183438748507. Its totient is φ = 183437891912.

The previous prime is 183438320171. The next prime is 183438320213. The reversal of 183438320209 is 902023834381.

The square root of 183438320209 is 428297.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902023834381 = 95233 ⋅9471757.

It can be written as a sum of positive squares in only one way, i.e., 109306278225 + 74132041984 = 330615^2 + 272272^2 .

It is not a de Polignac number, because 183438320209 - 2¹⁹ = 183437795921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (183438320269) 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, 214149 + ... + 642445.

Almost surely, 2^183438320209 is an apocalyptic number.

183438320209 is the 428297-th square number.

183438320209 is the 214149-th centered octagonal number.

It is an amenable number.

183438320209 is a deficient number, since it is larger than the sum of its proper divisors (428298).

183438320209 is an frugal number, since it uses more digits than its factorization.

183438320209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856594 (or 428297 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 183438320209 in words is "one hundred eighty-three billion, four hundred thirty-eight million, three hundred twenty thousand, two hundred nine".