18107081 has 2 divisors, whose sum is σ = 18107082. Its totient is φ = 18107080.

The previous prime is 18107077. The next prime is 18107083. The reversal of 18107081 is 18070181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 1428025 = 4084^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 18107081 - 2² = 18107077 is a prime.

It is a super-2 number, since 2×18107081² = 655732764681122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 18107083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18107081.

It is not a weakly prime, because it can be changed into another prime (18107083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9053540 + 9053541.

It is an arithmetic number, because the mean of its divisors is an integer number (9053541).

Almost surely, 2^18107081 is an apocalyptic number.

It is an amenable number.

18107081 is a deficient number, since it is larger than the sum of its proper divisors (1).

18107081 is an equidigital number, since it uses as much as digits as its factorization.

18107081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 26.

The square root of 18107081 is about 4255.2415912613. The cubic root of 18107081 is about 262.5928004466.

The spelling of 18107081 in words is "eighteen million, one hundred seven thousand, eighty-one".