6651223 has 2 divisors, whose sum is σ = 6651224. Its totient is φ = 6651222.

The previous prime is 6651221. The next prime is 6651251. The reversal of 6651223 is 3221566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6651223 - 2¹ = 6651221 is a prime.

Together with 6651221, it forms a pair of twin primes.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6651221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325611 + 3325612.

It is an arithmetic number, because the mean of its divisors is an integer number (3325612).

Almost surely, 2^6651223 is an apocalyptic number.

6651223 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651223 is an equidigital number, since it uses as much as digits as its factorization.

6651223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 6651223 is about 2578.9965102729. The cubic root of 6651223 is about 188.0617629423.

Adding to 6651223 its reverse (3221566), we get a palindrome (9872789).

The spelling of 6651223 in words is "six million, six hundred fifty-one thousand, two hundred twenty-three".