18620201 has 2 divisors, whose sum is σ = 18620202. Its totient is φ = 18620200.

The previous prime is 18620159. The next prime is 18620207. The reversal of 18620201 is 10202681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17808400 + 811801 = 4220^2 + 901^2 .

It is an emirp because it is prime and its reverse (10202681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18620201 - 2²² = 14425897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18620207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310100 + 9310101.

It is an arithmetic number, because the mean of its divisors is an integer number (9310101).

Almost surely, 2^18620201 is an apocalyptic number.

It is an amenable number.

18620201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620201 is an equidigital number, since it uses as much as digits as its factorization.

18620201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18620201 is about 4315.1130923766. The cubic root of 18620201 is about 265.0501910391.

Adding to 18620201 its reverse (10202681), we get a palindrome (28822882).

The spelling of 18620201 in words is "eighteen million, six hundred twenty thousand, two hundred one".