648049 has 4 divisors (see below), whose sum is σ = 650980. Its totient is φ = 645120.

The previous prime is 648047. The next prime is 648059. The reversal of 648049 is 940846.

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

It can be written as a sum of positive squares in 2 ways, for example, as 219024 + 429025 = 468^2 + 655^2 .

It is a cyclic number.

It is not a de Polignac number, because 648049 - 2¹ = 648047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648049.

It is not an unprimeable number, because it can be changed into a prime (648041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1104 + ... + 1585.

It is an arithmetic number, because the mean of its divisors is an integer number (162745).

2⁶⁴⁸⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

648049 is a deficient number, since it is larger than the sum of its proper divisors (2931).

648049 is a wasteful number, since it uses less digits than its factorization.

648049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 648049 is about 805.0149066943. The cubic root of 648049 is about 86.5371553434.

The spelling of 648049 in words is "six hundred forty-eight thousand, forty-nine".