18111081 has 8 divisors (see below), whose sum is σ = 24479200. Its totient is φ = 11908512.

The previous prime is 18111061. The next prime is 18111101. The reversal of 18111081 is 18011181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18111061) and next prime (18111101).

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

It is not a de Polignac number, because 18111081 - 2¹⁴ = 18094697 is a prime.

It is a super-3 number, since 3×18111081³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18111011) 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 7 ways as a sum of consecutive naturals, for example, 41131 + ... + 41568.

It is an arithmetic number, because the mean of its divisors is an integer number (3059900).

Almost surely, 2^18111081 is an apocalyptic number.

It is an amenable number.

18111081 is a deficient number, since it is larger than the sum of its proper divisors (6368119).

18111081 is an equidigital number, since it uses as much as digits as its factorization.

18111081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82775.

The product of its (nonzero) digits is 64, while the sum is 21.

The square root of 18111081 is about 4255.7115738734. The cubic root of 18111081 is about 262.6121353109.

The spelling of 18111081 in words is "eighteen million, one hundred eleven thousand, eighty-one".