18351308089 has 3 divisors (see below), whose sum is σ = 18351443557. Its totient is φ = 18351172622.

The previous prime is 18351308047. The next prime is 18351308093. The reversal of 18351308089 is 98080315381.

The square root of 18351308089 is 135467.

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: 98080315381 = 43 ⋅2280937567.

It is not a de Polignac number, because 18351308089 - 2¹¹ = 18351306041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18351308029) 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, 67734 + ... + 203200.

Almost surely, 2^18351308089 is an apocalyptic number.

18351308089 is the 135467-th square number.

18351308089 is the 67734-th centered octagonal number.

It is an amenable number.

18351308089 is a deficient number, since it is larger than the sum of its proper divisors (135468).

18351308089 is an frugal number, since it uses more digits than its factorization.

18351308089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270934 (or 135467 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 18351308089 in words is "eighteen billion, three hundred fifty-one million, three hundred eight thousand, eighty-nine".