201101209 has 2 divisors, whose sum is σ = 201101210. Its totient is φ = 201101208.

The previous prime is 201101207. The next prime is 201101231. The reversal of 201101209 is 902101102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198021184 + 3080025 = 14072^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101209 - 2¹ = 201101207 is a prime.

It is a super-2 number, since 2×201101209² = 80883392522523362, which contains 22 as substring.

Together with 201101207, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 201101192 and 201101201.

It is not a weakly prime, because it can be changed into another prime (201101207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550604 + 100550605.

It is an arithmetic number, because the mean of its divisors is an integer number (100550605).

Almost surely, 2^201101209 is an apocalyptic number.

It is an amenable number.

201101209 is a deficient number, since it is larger than the sum of its proper divisors (1).

201101209 is an equidigital number, since it uses as much as digits as its factorization.

201101209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 201101209 is about 14181.0157957743. The cubic root of 201101209 is about 585.8749019500.

The spelling of 201101209 in words is "two hundred one million, one hundred one thousand, two hundred nine".