655009 has 4 divisors (see below), whose sum is σ = 656640. Its totient is φ = 653380.

The previous prime is 655003. The next prime is 655013. The reversal of 655009 is 900556.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 655009 - 2³ = 655001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655001) 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, 264 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (164160).

2⁶⁵⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

655009 is a deficient number, since it is larger than the sum of its proper divisors (1631).

655009 is an equidigital number, since it uses as much as digits as its factorization.

655009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 655009 is about 809.3262630114. The cubic root of 655009 is about 86.8458537908.

The spelling of 655009 in words is "six hundred fifty-five thousand, nine".