4091009 has 4 divisors (see below), whose sum is σ = 4405716. Its totient is φ = 3776304.

The previous prime is 4090997. The next prime is 4091011. The reversal of 4091009 is 9001904.

4091009 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.

It can be written as a sum of positive squares in 2 ways, for example, as 760384 + 3330625 = 872^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 4091009 - 2⁸ = 4090753 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (4091069) 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, 157334 + ... + 157359.

It is an arithmetic number, because the mean of its divisors is an integer number (1101429).

Almost surely, 2^4091009 is an apocalyptic number.

It is an amenable number.

4091009 is a deficient number, since it is larger than the sum of its proper divisors (314707).

4091009 is a wasteful number, since it uses less digits than its factorization.

4091009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314706.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 4091009 is about 2022.6242854272. The cubic root of 4091009 is about 159.9349866073.

The spelling of 4091009 in words is "four million, ninety-one thousand, nine".