18022201 has 2 divisors, whose sum is σ = 18022202. Its totient is φ = 18022200.

The previous prime is 18022177. The next prime is 18022217. The reversal of 18022201 is 10222081.

It is an a-pointer prime, because the next prime (18022217) can be obtained adding 18022201 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 1212201 = 4100^2 + 1101^2 .

It is an emirp because it is prime and its reverse (10222081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18022201 - 2⁷ = 18022073 is a prime.

It is not a weakly prime, because it can be changed into another prime (18022231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9011100 + 9011101.

It is an arithmetic number, because the mean of its divisors is an integer number (9011101).

Almost surely, 2^18022201 is an apocalyptic number.

It is an amenable number.

18022201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18022201 is an equidigital number, since it uses as much as digits as its factorization.

18022201 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 16.

The square root of 18022201 is about 4245.2562937943. The cubic root of 18022201 is about 262.1818415973.

Adding to 18022201 its reverse (10222081), we get a palindrome (28244282).

The spelling of 18022201 in words is "eighteen million, twenty-two thousand, two hundred one".