6609959 has 4 divisors (see below), whose sum is σ = 6617520. Its totient is φ = 6602400.

The previous prime is 6609893. The next prime is 6609971. The reversal of 6609959 is 9599066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6609959 - 2¹⁶ = 6544423 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 (6609989) 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, 2267 + ... + 4284.

It is an arithmetic number, because the mean of its divisors is an integer number (1654380).

Almost surely, 2^6609959 is an apocalyptic number.

6609959 is a deficient number, since it is larger than the sum of its proper divisors (7561).

6609959 is a wasteful number, since it uses less digits than its factorization.

6609959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7560.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 6609959 is about 2570.9840528482. The cubic root of 6609959 is about 187.6720459379.

The spelling of 6609959 in words is "six million, six hundred nine thousand, nine hundred fifty-nine".