6521223 has 8 divisors (see below), whose sum is σ = 8720128. Its totient is φ = 4334904.

The previous prime is 6521209. The next prime is 6521243. The reversal of 6521223 is 3221256.

6521223 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6521223 - 2¹² = 6517127 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 6521223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1861 + ... + 4062.

It is an arithmetic number, because the mean of its divisors is an integer number (1090016).

Almost surely, 2^6521223 is an apocalyptic number.

6521223 is a deficient number, since it is larger than the sum of its proper divisors (2198905).

6521223 is a wasteful number, since it uses less digits than its factorization.

6521223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6293.

The product of its digits is 720, while the sum is 21.

The square root of 6521223 is about 2553.6685376141. The cubic root of 6521223 is about 186.8284527790.

Adding to 6521223 its reverse (3221256), we get a palindrome (9742479).

The spelling of 6521223 in words is "six million, five hundred twenty-one thousand, two hundred twenty-three".