648412549 has 4 divisors (see below), whose sum is σ = 648464236. Its totient is φ = 648360864.

The previous prime is 648412543. The next prime is 648412553. The reversal of 648412549 is 945214846.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 945214846 = 2 ⋅472607423.

It can be written as a sum of positive squares in 2 ways, for example, as 348083649 + 300328900 = 18657^2 + 17330^2 .

It is a cyclic number.

It is not a de Polignac number, because 648412549 - 2¹¹ = 648410501 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 (648412543) 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, 6307 + ... + 36559.

It is an arithmetic number, because the mean of its divisors is an integer number (162116059).

Almost surely, 2^648412549 is an apocalyptic number.

It is an amenable number.

648412549 is a deficient number, since it is larger than the sum of its proper divisors (51687).

648412549 is a wasteful number, since it uses less digits than its factorization.

648412549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51686.

The product of its digits is 276480, while the sum is 43.

The square root of 648412549 is about 25463.9460610487. The cubic root of 648412549 is about 865.5333447752.

The spelling of 648412549 in words is "six hundred forty-eight million, four hundred twelve thousand, five hundred forty-nine".