648519365 has 16 divisors (see below), whose sum is σ = 851830896. Its totient is φ = 471052800.

The previous prime is 648519337. The next prime is 648519367. The reversal of 648519365 is 563915846.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 299913124 + 348606241 = 17318^2 + 18671^2 .

It is a de Polignac number, because none of the positive numbers 2^k-648519365 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648519367) 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 15 ways as a sum of consecutive naturals, for example, 77816 + ... + 85745.

It is an arithmetic number, because the mean of its divisors is an integer number (53239431).

Almost surely, 2^648519365 is an apocalyptic number.

648519365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

648519365 is a deficient number, since it is larger than the sum of its proper divisors (203311531).

648519365 is a wasteful number, since it uses less digits than its factorization.

648519365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163640.

The product of its digits is 777600, while the sum is 47.

The square root of 648519365 is about 25466.0433715173. The cubic root of 648519365 is about 865.5808699368.

The spelling of 648519365 in words is "six hundred forty-eight million, five hundred nineteen thousand, three hundred sixty-five".