18209201 has 6 divisors (see below), whose sum is σ = 19218402. Its totient is φ = 17250480.

The previous prime is 18209197. The next prime is 18209203. The reversal of 18209201 is 10290281.

It can be written as a sum of positive squares in only one way, i.e., 17631601 + 577600 = 4199^2 + 760^2 .

It is not a de Polignac number, because 18209201 - 2² = 18209197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18209203) 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 in 5 ways as a sum of consecutive naturals, for example, 24860 + ... + 25581.

It is an arithmetic number, because the mean of its divisors is an integer number (3203067).

Almost surely, 2^18209201 is an apocalyptic number.

It is an amenable number.

18209201 is a deficient number, since it is larger than the sum of its proper divisors (1009201).

18209201 is an equidigital number, since it uses as much as digits as its factorization.

18209201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50479 (or 50460 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18209201 is about 4267.2240391149. The cubic root of 18209201 is about 263.0855307408.

Adding to 18209201 its reverse (10290281), we get a palindrome (28499482).

The spelling of 18209201 in words is "eighteen million, two hundred nine thousand, two hundred one".