648013 has 4 divisors (see below), whose sum is σ = 649728. Its totient is φ = 646300.

The previous prime is 648007. The next prime is 648019. The reversal of 648013 is 310846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310846 = 2 ⋅155423.

It is an interprime number because it is at equal distance from previous prime (648007) and next prime (648019).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648013 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648019) 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, 13 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (162432).

2⁶⁴⁸⁰¹³ is an apocalyptic number.

It is an amenable number.

648013 is a deficient number, since it is larger than the sum of its proper divisors (1715).

648013 is a wasteful number, since it uses less digits than its factorization.

648013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 648013 is about 804.9925465493. The cubic root of 648013 is about 86.5355528950.

Adding to 648013 its reverse (310846), we get a palindrome (958859).

The spelling of 648013 in words is "six hundred forty-eight thousand, thirteen".