6406321 has 2 divisors, whose sum is σ = 6406322. Its totient is φ = 6406320.

The previous prime is 6406313. The next prime is 6406343. The reversal of 6406321 is 1236046.

It is an a-pointer prime, because the next prime (6406343) can be obtained adding 6406321 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4260096 + 2146225 = 2064^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 6406321 - 2³ = 6406313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6406292 and 6406301.

It is not a weakly prime, because it can be changed into another prime (6406381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203160 + 3203161.

It is an arithmetic number, because the mean of its divisors is an integer number (3203161).

Almost surely, 2^6406321 is an apocalyptic number.

It is an amenable number.

6406321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6406321 is an equidigital number, since it uses as much as digits as its factorization.

6406321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6406321 is about 2531.0711171360. The cubic root of 6406321 is about 185.7246571554.

The spelling of 6406321 in words is "six million, four hundred six thousand, three hundred twenty-one".