18416081 has 2 divisors, whose sum is σ = 18416082. Its totient is φ = 18416080.

The previous prime is 18416071. The next prime is 18416107. The reversal of 18416081 is 18061481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15085456 + 3330625 = 3884^2 + 1825^2 .

It is an emirp because it is prime and its reverse (18061481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18416081 - 2⁶ = 18416017 is a prime.

It is a super-2 number, since 2×18416081² = 678304078797122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18416071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208040 + 9208041.

It is an arithmetic number, because the mean of its divisors is an integer number (9208041).

Almost surely, 2^18416081 is an apocalyptic number.

It is an amenable number.

18416081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18416081 is an equidigital number, since it uses as much as digits as its factorization.

18416081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18416081 is about 4291.3961597597. The cubic root of 18416081 is about 264.0781114517.

The spelling of 18416081 in words is "eighteen million, four hundred sixteen thousand, eighty-one".