648001 has 4 divisors (see below), whose sum is σ = 652500. Its totient is φ = 643504.

The previous prime is 647987. The next prime is 648007. The reversal of 648001 is 100846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100846 = 2 ⋅50423.

It can be written as a sum of positive squares in 2 ways, for example, as 39601 + 608400 = 199^2 + 780^2 .

It is a cyclic number.

It is not a de Polignac number, because 648001 - 2⁹ = 647489 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 648001.

It is not an unprimeable number, because it can be changed into a prime (648007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (163125).

2⁶⁴⁸⁰⁰¹ is an apocalyptic number.

It is an amenable number.

648001 is a deficient number, since it is larger than the sum of its proper divisors (4499).

648001 is a wasteful number, since it uses less digits than its factorization.

648001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4498.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 648001 is about 804.9850930297. The cubic root of 648001 is about 86.5350187323.

Adding to 648001 its reverse (100846), we get a palindrome (748847).

The spelling of 648001 in words is "six hundred forty-eight thousand, one".