18030312109 has 4 divisors (see below), whose sum is σ = 18069766204. Its totient is φ = 17990858016.

The previous prime is 18030312059. The next prime is 18030312133. The reversal of 18030312109 is 90121303081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90121303081 = 431 ⋅209098151.

It can be written as a sum of positive squares in 2 ways, for example, as 16236366084 + 1793946025 = 127422^2 + 42355^2 .

It is a cyclic number.

It is not a de Polignac number, because 18030312109 - 2¹¹ = 18030310061 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 (18030312169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19726362 + ... + 19727275.

It is an arithmetic number, because the mean of its divisors is an integer number (4517441551).

Almost surely, 2^18030312109 is an apocalyptic number.

It is an amenable number.

18030312109 is a deficient number, since it is larger than the sum of its proper divisors (39454095).

18030312109 is an equidigital number, since it uses as much as digits as its factorization.

18030312109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39454094.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 18030312109 in words is "eighteen billion, thirty million, three hundred twelve thousand, one hundred nine".