648517 has 4 divisors (see below), whose sum is σ = 652320. Its totient is φ = 644716.

The previous prime is 648509. The next prime is 648563. The reversal of 648517 is 715846.

648517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 648517 - 2³ = 648509 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (648217) 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, 1633 + ... + 1990.

It is an arithmetic number, because the mean of its divisors is an integer number (163080).

2⁶⁴⁸⁵¹⁷ is an apocalyptic number.

It is an amenable number.

648517 is a deficient number, since it is larger than the sum of its proper divisors (3803).

648517 is a wasteful number, since it uses less digits than its factorization.

648517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802.

The product of its digits is 6720, while the sum is 31.

The square root of 648517 is about 805.3055320808. The cubic root of 648517 is about 86.5579817744.

The spelling of 648517 in words is "six hundred forty-eight thousand, five hundred seventeen".