18122241 has 4 divisors (see below), whose sum is σ = 24162992. Its totient is φ = 12081492.

The previous prime is 18122207. The next prime is 18122243. The reversal of 18122241 is 14222181.

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: 14222181 = 3 ⋅4740727.

It is not a de Polignac number, because 18122241 - 2⁷ = 18122113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18122243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020371 + ... + 3020376.

It is an arithmetic number, because the mean of its divisors is an integer number (6040748).

Almost surely, 2^18122241 is an apocalyptic number.

It is an amenable number.

18122241 is a deficient number, since it is larger than the sum of its proper divisors (6040751).

18122241 is an equidigital number, since it uses as much as digits as its factorization.

18122241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6040750.

The product of its digits is 256, while the sum is 21.

The square root of 18122241 is about 4257.0225510326. The cubic root of 18122241 is about 262.6660645355. Note that the first 3 decimals are identical.

It can be divided in two parts, 181 and 22241, that added together give a palindrome (22422).

The spelling of 18122241 in words is "eighteen million, one hundred twenty-two thousand, two hundred forty-one".