2905509 has 4 divisors (see below), whose sum is σ = 3874016. Its totient is φ = 1937004.

The previous prime is 2905489. The next prime is 2905549. The reversal of 2905509 is 9055092.

2905509 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 not a de Polignac number, because 2905509 - 2⁵ = 2905477 is a prime.

It is a D-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 (2905549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484249 + ... + 484254.

It is an arithmetic number, because the mean of its divisors is an integer number (968504).

2^2905509 is an apocalyptic number.

It is an amenable number.

2905509 is a deficient number, since it is larger than the sum of its proper divisors (968507).

2905509 is an equidigital number, since it uses as much as digits as its factorization.

2905509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968506.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 2905509 is about 1704.5553672439. Note that the first 3 decimals coincide. The cubic root of 2905509 is about 142.6945572698.

The spelling of 2905509 in words is "two million, nine hundred five thousand, five hundred nine".