609965 has 4 divisors (see below), whose sum is σ = 731964. Its totient is φ = 487968.

The previous prime is 609929. The next prime is 609979. The reversal of 609965 is 569906.

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 218089 + 391876 = 467^2 + 626^2 .

It is a cyclic number.

It is not a de Polignac number, because 609965 - 2⁸ = 609709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 60992 + ... + 61001.

It is an arithmetic number, because the mean of its divisors is an integer number (182991).

2⁶⁰⁹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

609965 is a deficient number, since it is larger than the sum of its proper divisors (121999).

609965 is a wasteful number, since it uses less digits than its factorization.

609965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121998.

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

The square root of 609965 is about 781.0025608153. The cubic root of 609965 is about 84.8076388188.

The spelling of 609965 in words is "six hundred nine thousand, nine hundred sixty-five".