18701383009 has 3 divisors (see below), whose sum is σ = 18701519763. Its totient is φ = 18701246256.

The previous prime is 18701383003. The next prime is 18701383037. The reversal of 18701383009 is 90038310781.

The square root of 18701383009 is 136753.

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: 90038310781 = 2111 ⋅42651971.

It can be written as a sum of positive squares in only one way, i.e., 2196328225 + 16505054784 = 46865^2 + 128472^2 .

It is not a de Polignac number, because 18701383009 - 2⁵ = 18701382977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18701383003) 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, 68377 + ... + 205129.

It is an arithmetic number, because the mean of its divisors is an integer number (6233839921).

Almost surely, 2^18701383009 is an apocalyptic number.

18701383009 is the 136753-rd square number.

18701383009 is the 68377-th centered octagonal number.

It is an amenable number.

18701383009 is a deficient number, since it is larger than the sum of its proper divisors (136754).

18701383009 is an frugal number, since it uses more digits than its factorization.

18701383009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273506 (or 136753 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 18701383009 in words is "eighteen billion, seven hundred one million, three hundred eighty-three thousand, nine".