6553321 has 4 divisors (see below), whose sum is σ = 6838272. Its totient is φ = 6268372.

The previous prime is 6553319. The next prime is 6553331. The reversal of 6553321 is 1233556.

It is a happy number.

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 6553321 - 2¹ = 6553319 is a prime.

It is a super-2 number, since 2×6553321² = 85892032258082, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6553331) 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, 142441 + ... + 142486.

It is an arithmetic number, because the mean of its divisors is an integer number (1709568).

Almost surely, 2^6553321 is an apocalyptic number.

It is an amenable number.

6553321 is a deficient number, since it is larger than the sum of its proper divisors (284951).

6553321 is a wasteful number, since it uses less digits than its factorization.

6553321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284950.

The product of its digits is 2700, while the sum is 25.

The square root of 6553321 is about 2559.9455072325. The cubic root of 6553321 is about 187.1344796059.

Adding to 6553321 its reverse (1233556), we get a palindrome (7786877).

The spelling of 6553321 in words is "six million, five hundred fifty-three thousand, three hundred twenty-one".