609663 has 4 divisors (see below), whose sum is σ = 812888. Its totient is φ = 406440.

The previous prime is 609641. The next prime is 609673. The reversal of 609663 is 366906.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 609663 - 2⁶ = 609599 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 609663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609613) 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, 101608 + ... + 101613.

It is an arithmetic number, because the mean of its divisors is an integer number (203222).

2⁶⁰⁹⁶⁶³ is an apocalyptic number.

609663 is a deficient number, since it is larger than the sum of its proper divisors (203225).

609663 is a wasteful number, since it uses less digits than its factorization.

609663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203224.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 609663 is about 780.8091956426. The cubic root of 609663 is about 84.7936401276.

Adding to 609663 its product of nonzero digits (5832), we get a triangular number (615495 = T₁₁₀₉).

The spelling of 609663 in words is "six hundred nine thousand, six hundred sixty-three".