18241181 has 6 divisors (see below), whose sum is σ = 21219390. Its totient is φ = 15635256.

The previous prime is 18241163. The next prime is 18241189. The reversal of 18241181 is 18114281.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 8281 = 4270^2 + 91^2 .

It is not a de Polignac number, because 18241181 - 2¹⁸ = 17979037 is a prime.

It is a super-2 number, since 2×18241181² = 665481368549522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18241181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18241189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186086 + ... + 186183.

It is an arithmetic number, because the mean of its divisors is an integer number (3536565).

Almost surely, 2^18241181 is an apocalyptic number.

It is an amenable number.

18241181 is a deficient number, since it is larger than the sum of its proper divisors (2978209).

18241181 is an equidigital number, since it uses as much as digits as its factorization.

18241181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372283 (or 372276 counting only the distinct ones).

The product of its digits is 512, while the sum is 26.

The square root of 18241181 is about 4270.9695620550. The cubic root of 18241181 is about 263.2394557569.

The spelling of 18241181 in words is "eighteen million, two hundred forty-one thousand, one hundred eighty-one".