201201209 has 4 divisors (see below), whose sum is σ = 219492240. Its totient is φ = 182910180.

The previous prime is 201201193. The next prime is 201201251. The reversal of 201201209 is 902102102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201201209 - 2⁴ = 201201193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201201289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9145499 + ... + 9145520.

It is an arithmetic number, because the mean of its divisors is an integer number (54873060).

Almost surely, 2^201201209 is an apocalyptic number.

It is an amenable number.

201201209 is a deficient number, since it is larger than the sum of its proper divisors (18291031).

201201209 is a wasteful number, since it uses less digits than its factorization.

201201209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291030.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 201201209 is about 14184.5411980790. The cubic root of 201201209 is about 585.9719969767.

The spelling of 201201209 in words is "two hundred one million, two hundred one thousand, two hundred nine".