650009 has 4 divisors (see below), whose sum is σ = 684240. Its totient is φ = 615780.

The previous prime is 649991. The next prime is 650011. The reversal of 650009 is 900056.

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 650009 - 2¹⁶ = 584473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650059) by changing a digit.

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, 17087 + ... + 17124.

It is an arithmetic number, because the mean of its divisors is an integer number (171060).

2⁶⁵⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

650009 is a deficient number, since it is larger than the sum of its proper divisors (34231).

650009 is a wasteful number, since it uses less digits than its factorization.

650009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34230.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 650009 is about 806.2313563736. The cubic root of 650009 is about 86.6243103349.

Subtracting 650009 from its reverse (900056), we obtain a cube (250047 = 63³).

The spelling of 650009 in words is "six hundred fifty thousand, nine".