2009761109 has 4 divisors (see below), whose sum is σ = 2014927980. Its totient is φ = 2004594240.

The previous prime is 2009761099. The next prime is 2009761111. The reversal of 2009761109 is 9011679002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1176284209 + 833476900 = 34297^2 + 28870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009761109 - 2²⁰ = 2008712533 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 (2009761009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2582852 + ... + 2583629.

It is an arithmetic number, because the mean of its divisors is an integer number (503731995).

Almost surely, 2^2009761109 is an apocalyptic number.

It is an amenable number.

2009761109 is a deficient number, since it is larger than the sum of its proper divisors (5166871).

2009761109 is an equidigital number, since it uses as much as digits as its factorization.

2009761109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166870.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 2009761109 is about 44830.3592334480. The cubic root of 2009761109 is about 1261.9674287921.

The spelling of 2009761109 in words is "two billion, nine million, seven hundred sixty-one thousand, one hundred nine".