18112161 has 4 divisors (see below), whose sum is σ = 24149552. Its totient is φ = 12074772.

The previous prime is 18112147. The next prime is 18112169. The reversal of 18112161 is 16121181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16121181 = 3 ⋅5373727.

It is not a de Polignac number, because 18112161 - 2¹⁹ = 17587873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18112169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3018691 + ... + 3018696.

It is an arithmetic number, because the mean of its divisors is an integer number (6037388).

Almost surely, 2^18112161 is an apocalyptic number.

It is an amenable number.

18112161 is a deficient number, since it is larger than the sum of its proper divisors (6037391).

18112161 is an equidigital number, since it uses as much as digits as its factorization.

18112161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6037390.

The product of its digits is 96, while the sum is 21.

The square root of 18112161 is about 4255.8384602802. The cubic root of 18112161 is about 262.6173552362.

The spelling of 18112161 in words is "eighteen million, one hundred twelve thousand, one hundred sixty-one".