2109109 has 2 divisors, whose sum is σ = 2109110. Its totient is φ = 2109108.

The previous prime is 2109103. The next prime is 2109119. The reversal of 2109109 is 9019012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2022084 + 87025 = 1422^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109109 - 2³ = 2109101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2109109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054554 + 1054555.

It is an arithmetic number, because the mean of its divisors is an integer number (1054555).

2^2109109 is an apocalyptic number.

It is an amenable number.

2109109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109109 is an equidigital number, since it uses as much as digits as its factorization.

2109109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 2109109 is about 1452.2771774011. The cubic root of 2109109 is about 128.2428049166.

Subtracting 2109109 from its reverse (9019012), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2109109 in words is "two million, one hundred nine thousand, one hundred nine".