18106081 has 8 divisors (see below), whose sum is σ = 21032384. Its totient is φ = 15264720.

The previous prime is 18106043. The next prime is 18106087. The reversal of 18106081 is 18060181.

It is a happy number.

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 18106081 - 2¹³ = 18097889 is a prime.

It is a super-2 number, since 2×18106081² = 655660338357122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18106087) 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, 20775 + ... + 21628.

It is an arithmetic number, because the mean of its divisors is an integer number (2629048).

Almost surely, 2^18106081 is an apocalyptic number.

It is an amenable number.

18106081 is a deficient number, since it is larger than the sum of its proper divisors (2926303).

18106081 is an equidigital number, since it uses as much as digits as its factorization.

18106081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42471.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 18106081 is about 4255.1240874973. The cubic root of 18106081 is about 262.5879662856.

The spelling of 18106081 in words is "eighteen million, one hundred six thousand, eighty-one".