201109 has 4 divisors (see below), whose sum is σ = 203616. Its totient is φ = 198604.

The previous prime is 201107. The next prime is 201119. The reversal of 201109 is 901102.

201109 = 2² + 3² + ... + 84².

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 201109 - 2¹ = 201107 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201101) 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, 1129 + ... + 1294.

It is an arithmetic number, because the mean of its divisors is an integer number (50904).

2²⁰¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

201109 is a deficient number, since it is larger than the sum of its proper divisors (2507).

201109 is an equidigital number, since it uses as much as digits as its factorization.

201109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 201109 is about 448.4517811315. The cubic root of 201109 is about 58.5882467780.

The spelling of 201109 in words is "two hundred one thousand, one hundred nine".