609659 has 4 divisors (see below), whose sum is σ = 621216. Its totient is φ = 598104.

The previous prime is 609641. The next prime is 609673. The reversal of 609659 is 956906.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 956906 = 2 ⋅478453.

It is a cyclic number.

It is not a de Polignac number, because 609659 - 2⁸ = 609403 is a prime.

It is a d-powerful number, because it can be written as 6 + 0 + 6 + 9² + 5⁷ + 9⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609619) 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, 5699 + ... + 5804.

It is an arithmetic number, because the mean of its divisors is an integer number (155304).

2⁶⁰⁹⁶⁵⁹ is an apocalyptic number.

609659 is a deficient number, since it is larger than the sum of its proper divisors (11557).

609659 is a wasteful number, since it uses less digits than its factorization.

609659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11556.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 609659 is about 780.8066341931. The cubic root of 609659 is about 84.7934546835.

The spelling of 609659 in words is "six hundred nine thousand, six hundred fifty-nine".