18118361 has 2 divisors, whose sum is σ = 18118362. Its totient is φ = 18118360.

The previous prime is 18118357. The next prime is 18118367. The reversal of 18118361 is 16381181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12145225 + 5973136 = 3485^2 + 2444^2 .

It is a cyclic number.

It is not a de Polignac number, because 18118361 - 2² = 18118357 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18118367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9059180 + 9059181.

It is an arithmetic number, because the mean of its divisors is an integer number (9059181).

Almost surely, 2^18118361 is an apocalyptic number.

It is an amenable number.

18118361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18118361 is an equidigital number, since it uses as much as digits as its factorization.

18118361 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18118361 is about 4256.5668090610. The cubic root of 18118361 is about 262.6473174598.

The spelling of 18118361 in words is "eighteen million, one hundred eighteen thousand, three hundred sixty-one".