18055081 has 8 divisors (see below), whose sum is σ = 20376000. Its totient is φ = 15847440.

The previous prime is 18055061. The next prime is 18055091.

18055081 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 18055081 - 2⁵ = 18055049 is a prime.

It is a super-2 number, since 2×18055081² = 651971899833122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18055031) 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, 27981 + ... + 28618.

It is an arithmetic number, because the mean of its divisors is an integer number (2547000).

Almost surely, 2^18055081 is an apocalyptic number.

18055081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18055081 is a deficient number, since it is larger than the sum of its proper divisors (2320919).

18055081 is a wasteful number, since it uses less digits than its factorization.

18055081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56639.

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 18055081 is about 4249.1270868262. The cubic root of 18055081 is about 262.3411876871.

It can be divided in two parts, 1805 and 5081, that added together give a palindrome (6886).

The spelling of 18055081 in words is "eighteen million, fifty-five thousand, eighty-one".