648217 has 2 divisors, whose sum is σ = 648218. Its totient is φ = 648216.

The previous prime is 648211. The next prime is 648229. The reversal of 648217 is 712846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 491401 + 156816 = 701^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 648217 - 2¹¹ = 646169 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (648211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324108 + 324109.

It is an arithmetic number, because the mean of its divisors is an integer number (324109).

2⁶⁴⁸²¹⁷ is an apocalyptic number.

It is an amenable number.

648217 is a deficient number, since it is larger than the sum of its proper divisors (1).

648217 is an equidigital number, since it uses as much as digits as its factorization.

648217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 648217 is about 805.1192458264. The cubic root of 648217 is about 86.5446326514.

It can be divided in two parts, 64 and 8217, that added together give a square (8281 = 91²).

The spelling of 648217 in words is "six hundred forty-eight thousand, two hundred seventeen".