663213 has 4 divisors (see below), whose sum is σ = 884288. Its totient is φ = 442140.

The previous prime is 663209. The next prime is 663239. The reversal of 663213 is 312366.

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 not a de Polignac number, because 663213 - 2² = 663209 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

663213 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 663213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663203) 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, 110533 + ... + 110538.

It is an arithmetic number, because the mean of its divisors is an integer number (221072).

2⁶⁶³²¹³ is an apocalyptic number.

It is an amenable number.

663213 is a deficient number, since it is larger than the sum of its proper divisors (221075).

663213 is a wasteful number, since it uses less digits than its factorization.

663213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221074.

The product of its digits is 648, while the sum is 21.

The square root of 663213 is about 814.3789044419. The cubic root of 663213 is about 87.2069324371.

Adding to 663213 its reverse (312366), we get a palindrome (975579).

The spelling of 663213 in words is "six hundred sixty-three thousand, two hundred thirteen".