18290081 has 4 divisors (see below), whose sum is σ = 18320532. Its totient is φ = 18259632.

The previous prime is 18290053. The next prime is 18290087. The reversal of 18290081 is 18009281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18009281 = 269 ⋅66949.

It can be written as a sum of positive squares in 2 ways, for example, as 312481 + 17977600 = 559^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 18290081 - 2⁶ = 18290017 is a prime.

It is a super-2 number, since 2×18290081² = 669054125973122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18290087) 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 3 ways as a sum of consecutive naturals, for example, 14306 + ... + 15531.

It is an arithmetic number, because the mean of its divisors is an integer number (4580133).

Almost surely, 2^18290081 is an apocalyptic number.

It is an amenable number.

18290081 is a deficient number, since it is larger than the sum of its proper divisors (30451).

18290081 is an equidigital number, since it uses as much as digits as its factorization.

18290081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30450.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 18290081 is about 4276.6904260187. The cubic root of 18290081 is about 263.4744720446.

The spelling of 18290081 in words is "eighteen million, two hundred ninety thousand, eighty-one".