648213 has 4 divisors (see below), whose sum is σ = 864288. Its totient is φ = 432140.

The previous prime is 648211. The next prime is 648217. The reversal of 648213 is 312846.

It is a happy number.

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 648213 - 2¹ = 648211 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648211) 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, 108033 + ... + 108038.

It is an arithmetic number, because the mean of its divisors is an integer number (216072).

2⁶⁴⁸²¹³ is an apocalyptic number.

It is an amenable number.

648213 is a deficient number, since it is larger than the sum of its proper divisors (216075).

648213 is a wasteful number, since it uses less digits than its factorization.

648213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216074.

The product of its digits is 1152, while the sum is 24.

The square root of 648213 is about 805.1167617184. The cubic root of 648213 is about 86.5444546353.

It can be divided in two parts, 648 and 213, that added together give a triangular number (861 = T₄₁).

The spelling of 648213 in words is "six hundred forty-eight thousand, two hundred thirteen".