18893327209 has 3 divisors (see below), whose sum is σ = 18893464663. Its totient is φ = 18893189756.

The previous prime is 18893327197. The next prime is 18893327221. The reversal of 18893327209 is 90272339881.

The square root of 18893327209 is 137453.

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 is an interprime number because it is at equal distance from previous prime (18893327197) and next prime (18893327221).

It can be written as a sum of positive squares in only one way, i.e., 5070152025 + 13823175184 = 71205^2 + 117572^2 .

It is not a de Polignac number, because 18893327209 - 2³¹ = 16745843561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18893327249) 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, 68727 + ... + 206179.

Almost surely, 2^18893327209 is an apocalyptic number.

18893327209 is the 137453-rd square number.

18893327209 is the 68727-th centered octagonal number.

It is an amenable number.

18893327209 is a deficient number, since it is larger than the sum of its proper divisors (137454).

18893327209 is an frugal number, since it uses more digits than its factorization.

18893327209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274906 (or 137453 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 18893327209 in words is "eighteen billion, eight hundred ninety-three million, three hundred twenty-seven thousand, two hundred nine".