6321661 has 8 divisors (see below), whose sum is σ = 6681920. Its totient is φ = 5964192.

The previous prime is 6321647. The next prime is 6321677. The reversal of 6321661 is 1661236.

6321661 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 a cyclic number.

It is not a de Polignac number, because 6321661 - 2¹¹ = 6319613 is a prime.

6321661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6321611) 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, 5416 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (835240).

Almost surely, 2^6321661 is an apocalyptic number.

It is an amenable number.

6321661 is a deficient number, since it is larger than the sum of its proper divisors (360259).

6321661 is a wasteful number, since it uses less digits than its factorization.

6321661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395.

The product of its digits is 1296, while the sum is 25.

The square root of 6321661 is about 2514.2913514547. The cubic root of 6321661 is about 184.9029049787.

Adding to 6321661 its reverse (1661236), we get a palindrome (7982897).

The spelling of 6321661 in words is "six million, three hundred twenty-one thousand, six hundred sixty-one".