648509609 has 8 divisors (see below), whose sum is σ = 707715360. Its totient is φ = 589345600.

The previous prime is 648509593. The next prime is 648509621. The reversal of 648509609 is 906905846.

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

It is a cyclic number.

It is not a de Polignac number, because 648509609 - 2⁴ = 648509593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648509689) 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, 28337 + ... + 45825.

It is an arithmetic number, because the mean of its divisors is an integer number (88464420).

Almost surely, 2^648509609 is an apocalyptic number.

It is an amenable number.

648509609 is a deficient number, since it is larger than the sum of its proper divisors (59205751).

648509609 is a wasteful number, since it uses less digits than its factorization.

648509609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20871.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 648509609 is about 25465.8518216061. The cubic root of 648509609 is about 865.5765294602.

The spelling of 648509609 in words is "six hundred forty-eight million, five hundred nine thousand, six hundred nine".