18165081 has 8 divisors (see below), whose sum is σ = 26421984. Its totient is φ = 11009120.

The previous prime is 18165079. The next prime is 18165127. The reversal of 18165081 is 18056181.

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 18165081 - 2¹ = 18165079 is a prime.

It is a super-2 number, since 2×18165081² = 659940335473122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18165001) 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, 275196 + ... + 275261.

It is an arithmetic number, because the mean of its divisors is an integer number (3302748).

Almost surely, 2^18165081 is an apocalyptic number.

18165081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18165081 is a deficient number, since it is larger than the sum of its proper divisors (8256903).

18165081 is a wasteful number, since it uses less digits than its factorization.

18165081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550471.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 18165081 is about 4262.0512667025. The cubic root of 18165081 is about 262.8728777910.

Subtracting from 18165081 its reverse (18056181), we obtain a square (108900 = 330²).

The spelling of 18165081 in words is "eighteen million, one hundred sixty-five thousand, eighty-one".