654009 has 4 divisors (see below), whose sum is σ = 872016. Its totient is φ = 436004.

The previous prime is 654001. The next prime is 654011. The reversal of 654009 is 900456.

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.

It is a cyclic number.

It is not a de Polignac number, because 654009 - 2³ = 654001 is a prime.

It is a D-number.

It is a Curzon number.

654009 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 654009.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 654009.

It is not an unprimeable number, because it can be changed into a prime (654001) 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, 108999 + ... + 109004.

It is an arithmetic number, because the mean of its divisors is an integer number (218004).

2⁶⁵⁴⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

654009 is a deficient number, since it is larger than the sum of its proper divisors (218007).

654009 is a wasteful number, since it uses less digits than its factorization.

654009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218006.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 654009 is about 808.7082292150. The cubic root of 654009 is about 86.8016355245.

The spelling of 654009 in words is "six hundred fifty-four thousand, nine".