648518323 has 4 divisors (see below), whose sum is σ = 648908560. Its totient is φ = 648128088.

The previous prime is 648518309. The next prime is 648518359. The reversal of 648518323 is 323815846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648518323 - 2⁹ = 648517811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648518723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192615 + ... + 195952.

It is an arithmetic number, because the mean of its divisors is an integer number (162227140).

Almost surely, 2^648518323 is an apocalyptic number.

648518323 is a deficient number, since it is larger than the sum of its proper divisors (390237).

648518323 is a wasteful number, since it uses less digits than its factorization.

648518323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390236.

The product of its digits is 138240, while the sum is 40.

The square root of 648518323 is about 25466.0229128932. The cubic root of 648518323 is about 865.5804063496.

The spelling of 648518323 in words is "six hundred forty-eight million, five hundred eighteen thousand, three hundred twenty-three".