18162081 has 24 divisors (see below), whose sum is σ = 31561920. Its totient is φ = 9831456.

The previous prime is 18162071. The next prime is 18162107. The reversal of 18162081 is 18026181.

It is not a de Polignac number, because 18162081 - 2⁵ = 18162049 is a prime.

It is a super-2 number, since 2×18162081² = 659722372501122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18162031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6390 + ... + 8783.

It is an arithmetic number, because the mean of its divisors is an integer number (1315080).

Almost surely, 2^18162081 is an apocalyptic number.

It is an amenable number.

18162081 is a deficient number, since it is larger than the sum of its proper divisors (13399839).

18162081 is a wasteful number, since it uses less digits than its factorization.

18162081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15205 (or 15202 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18162081 is about 4261.6993089612. The cubic root of 18162081 is about 262.8584056644.

The spelling of 18162081 in words is "eighteen million, one hundred sixty-two thousand, eighty-one".