6621231 has 8 divisors (see below), whose sum is σ = 8848000. Its totient is φ = 4404312.

The previous prime is 6621191. The next prime is 6621233. The reversal of 6621231 is 1321266.

It is a happy number.

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

It is not a de Polignac number, because 6621231 - 2⁷ = 6621103 is a prime.

It is a super-2 number, since 2×6621231² = 87681399910722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6621198 and 6621207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621233) 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, 715 + ... + 3708.

It is an arithmetic number, because the mean of its divisors is an integer number (1106000).

Almost surely, 2^6621231 is an apocalyptic number.

6621231 is a deficient number, since it is larger than the sum of its proper divisors (2226769).

6621231 is a wasteful number, since it uses less digits than its factorization.

6621231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4925.

The product of its digits is 432, while the sum is 21.

The square root of 6621231 is about 2573.1752758023. The cubic root of 6621231 is about 187.7786647510.

Adding to 6621231 its reverse (1321266), we get a palindrome (7942497).

The spelling of 6621231 in words is "six million, six hundred twenty-one thousand, two hundred thirty-one".