647213 has 4 divisors (see below), whose sum is σ = 739680. Its totient is φ = 554748.

The previous prime is 647209. The next prime is 647219. The reversal of 647213 is 312746.

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 647213 - 2² = 647209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647213.

It is not an unprimeable number, because it can be changed into a prime (647219) 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, 46223 + ... + 46236.

It is an arithmetic number, because the mean of its divisors is an integer number (184920).

2⁶⁴⁷²¹³ is an apocalyptic number.

It is an amenable number.

647213 is a deficient number, since it is larger than the sum of its proper divisors (92467).

647213 is an equidigital number, since it uses as much as digits as its factorization.

647213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92466.

The product of its digits is 1008, while the sum is 23.

The square root of 647213 is about 804.4954940831. The cubic root of 647213 is about 86.4999276064.

Adding to 647213 its reverse (312746), we get a palindrome (959959).

The spelling of 647213 in words is "six hundred forty-seven thousand, two hundred thirteen".