2005109 has 4 divisors (see below), whose sum is σ = 2035104. Its totient is φ = 1975116.

The previous prime is 2005103. The next prime is 2005121. The reversal of 2005109 is 9015002.

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 2005109 - 2¹⁶ = 1939573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005103) 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, 14897 + ... + 15030.

It is an arithmetic number, because the mean of its divisors is an integer number (508776).

2^2005109 is an apocalyptic number.

It is an amenable number.

2005109 is a deficient number, since it is larger than the sum of its proper divisors (29995).

2005109 is an equidigital number, since it uses as much as digits as its factorization.

2005109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29994.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 2005109 is about 1416.0187145656. The cubic root of 2005109 is about 126.0992960454.

The spelling of 2005109 in words is "two million, five thousand, one hundred nine".