646213 has 4 divisors (see below), whose sum is σ = 650700. Its totient is φ = 641728.

The previous prime is 646199. The next prime is 646237. The reversal of 646213 is 312646.

646213 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.

It can be written as a sum of positive squares in 2 ways, for example, as 33124 + 613089 = 182^2 + 783^2 .

It is a cyclic number.

It is not a de Polignac number, because 646213 - 2⁵ = 646181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646253) 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, 2020 + ... + 2317.

It is an arithmetic number, because the mean of its divisors is an integer number (162675).

2⁶⁴⁶²¹³ is an apocalyptic number.

It is an amenable number.

646213 is a deficient number, since it is larger than the sum of its proper divisors (4487).

646213 is a wasteful number, since it uses less digits than its factorization.

646213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486.

The product of its digits is 864, while the sum is 22.

The square root of 646213 is about 803.8737463060. The cubic root of 646213 is about 86.4553546884.

Adding to 646213 its reverse (312646), we get a palindrome (958859).

The spelling of 646213 in words is "six hundred forty-six thousand, two hundred thirteen".