18091804331 has 4 divisors (see below), whose sum is σ = 18092104200. Its totient is φ = 18091504464.

The previous prime is 18091804307. The next prime is 18091804349. The reversal of 18091804331 is 13340819081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13340819081 = 7457 ⋅1789033.

It is a cyclic number.

It is not a de Polignac number, because 18091804331 - 2²² = 18087610027 is a prime.

It is a super-2 number, since 2×18091804331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18091804231) 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, 24401 + ... + 191778.

It is an arithmetic number, because the mean of its divisors is an integer number (4523026050).

Almost surely, 2^18091804331 is an apocalyptic number.

18091804331 is a deficient number, since it is larger than the sum of its proper divisors (299869).

18091804331 is an equidigital number, since it uses as much as digits as its factorization.

18091804331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299868.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 18091804331 in words is "eighteen billion, ninety-one million, eight hundred four thousand, three hundred thirty-one".