648512511 has 4 divisors (see below), whose sum is σ = 864683352. Its totient is φ = 432341672.

The previous prime is 648512479. The next prime is 648512519. The reversal of 648512511 is 115215846.

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 648512511 - 2⁵ = 648512479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648512519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108085416 + ... + 108085421.

It is an arithmetic number, because the mean of its divisors is an integer number (216170838).

Almost surely, 2^648512511 is an apocalyptic number.

648512511 is a deficient number, since it is larger than the sum of its proper divisors (216170841).

648512511 is a wasteful number, since it uses less digits than its factorization.

648512511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216170840.

The product of its digits is 9600, while the sum is 33.

The square root of 648512511 is about 25465.9087998053. The cubic root of 648512511 is about 865.5778205741.

The spelling of 648512511 in words is "six hundred forty-eight million, five hundred twelve thousand, five hundred eleven".