18200201 has 4 divisors (see below), whose sum is σ = 18322500. Its totient is φ = 18077904.

The previous prime is 18200191. The next prime is 18200209. The reversal of 18200201 is 10200281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4687225 + 13512976 = 2165^2 + 3676^2 .

It is a cyclic number.

It is not a de Polignac number, because 18200201 - 2²² = 14005897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18200209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60926 + ... + 61223.

It is an arithmetic number, because the mean of its divisors is an integer number (4580625).

Almost surely, 2^18200201 is an apocalyptic number.

It is an amenable number.

18200201 is a deficient number, since it is larger than the sum of its proper divisors (122299).

18200201 is a wasteful number, since it uses less digits than its factorization.

18200201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122298.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 18200201 is about 4266.1693590386. The cubic root of 18200201 is about 263.0421797635.

Adding to 18200201 its reverse (10200281), we get a palindrome (28400482).

The spelling of 18200201 in words is "eighteen million, two hundred thousand, two hundred one".