18122201 has 2 divisors, whose sum is σ = 18122202. Its totient is φ = 18122200.

The previous prime is 18122191. The next prime is 18122207. The reversal of 18122201 is 10222181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 524176 = 4195^2 + 724^2 .

It is a cyclic number.

It is not a de Polignac number, because 18122201 - 2¹⁴ = 18105817 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18122201.

It is not a weakly prime, because it can be changed into another prime (18122207) 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 as a sum of consecutive naturals, namely, 9061100 + 9061101.

It is an arithmetic number, because the mean of its divisors is an integer number (9061101).

Almost surely, 2^18122201 is an apocalyptic number.

It is an amenable number.

18122201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122201 is an equidigital number, since it uses as much as digits as its factorization.

18122201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18122201 is about 4257.0178529106. The cubic root of 18122201 is about 262.6658712803.

Adding to 18122201 its reverse (10222181), we get a palindrome (28344382).

The spelling of 18122201 in words is "eighteen million, one hundred twenty-two thousand, two hundred one".