209112101 has 4 divisors (see below), whose sum is σ = 228122304. Its totient is φ = 190101900.

The previous prime is 209112091. The next prime is 209112103. The reversal of 209112101 is 101211902.

209112101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 209112101 - 2¹⁴ = 209095717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209112103) 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, 9505085 + ... + 9505106.

It is an arithmetic number, because the mean of its divisors is an integer number (57030576).

Almost surely, 2^209112101 is an apocalyptic number.

It is an amenable number.

209112101 is a deficient number, since it is larger than the sum of its proper divisors (19010203).

209112101 is a wasteful number, since it uses less digits than its factorization.

209112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19010202.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 209112101 is about 14460.7088692083. The cubic root of 209112101 is about 593.5532971908.

The spelling of 209112101 in words is "two hundred nine million, one hundred twelve thousand, one hundred one".