6613909 has 4 divisors (see below), whose sum is σ = 6623404. Its totient is φ = 6604416.

The previous prime is 6613891. The next prime is 6613913. The reversal of 6613909 is 9093166.

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 3294225 + 3319684 = 1815^2 + 1822^2 .

It is a cyclic number.

It is not a de Polignac number, because 6613909 - 2⁷ = 6613781 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 (6613979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3612 + ... + 5125.

It is an arithmetic number, because the mean of its divisors is an integer number (1655851).

Almost surely, 2^6613909 is an apocalyptic number.

It is an amenable number.

6613909 is a deficient number, since it is larger than the sum of its proper divisors (9495).

6613909 is an equidigital number, since it uses as much as digits as its factorization.

6613909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 6613909 is about 2571.7521264694. The cubic root of 6613909 is about 187.7094217102.

The spelling of 6613909 in words is "six million, six hundred thirteen thousand, nine hundred nine".