18144181 has 8 divisors (see below), whose sum is σ = 20276928. Its totient is φ = 16092000.

The previous prime is 18144173. The next prime is 18144193.

18144181 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18144181 - 2³ = 18144173 is a prime.

It is a super-2 number, since 2×18144181² = 658422608321522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18144131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19665 + ... + 20566.

It is an arithmetic number, because the mean of its divisors is an integer number (2534616).

Almost surely, 2^18144181 is an apocalyptic number.

18144181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18144181 is a deficient number, since it is larger than the sum of its proper divisors (2132747).

18144181 is a wasteful number, since it uses less digits than its factorization.

18144181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40283.

The product of its digits is 1024, while the sum is 28.

The square root of 18144181 is about 4259.5986900176. The cubic root of 18144181 is about 262.7720221701.

It can be divided in two parts, 1814 and 4181, that added together give a palindrome (5995).

The spelling of 18144181 in words is "eighteen million, one hundred forty-four thousand, one hundred eighty-one".