609 has 8 divisors (see below), whose sum is σ = 960. Its totient is φ = 336.

The previous prime is 607. The next prime is 613. The reversal of 609 is 906.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 609 - 2^{1} = 607 is a prime.

609 is a strobogrammatic number because it is the same when read upside-down.

609 is a modest number, since divided by 9 gives 6 as remainder.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7 + ... + 35.

It is an arithmetic number, because the mean of its divisors is an integer number (120).

It is a Proth number, since it is equal to 19 ⋅ 2^{5} + 1 and 19 < 2^{5}.

It is an amenable number.

609 is a deficient number, since it is larger than the sum of its proper divisors (351).

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

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

The sum of its prime factors is 39.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 609 is about 24.6779253585. The cubic root of 609 is about 8.4762891679.

Subtracting from 609 its product of nonzero digits (54), we obtain a palindrome (555).

The spelling of 609 in words is "six hundred nine", and thus it is an aban number and an oban number.

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