6321409 has 2 divisors, whose sum is σ = 6321410. Its totient is φ = 6321408.

The previous prime is 6321407. The next prime is 6321443. The reversal of 6321409 is 9041236.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4080400 + 2241009 = 2020^2 + 1497^2 .

It is a cyclic number.

It is not a de Polignac number, because 6321409 - 2¹ = 6321407 is a prime.

Together with 6321407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6321401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3160704 + 3160705.

It is an arithmetic number, because the mean of its divisors is an integer number (3160705).

Almost surely, 2^6321409 is an apocalyptic number.

It is an amenable number.

6321409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6321409 is an equidigital number, since it uses as much as digits as its factorization.

6321409 is an evil number, because the sum of its binary digits is even.

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

The square root of 6321409 is about 2514.2412374313. The cubic root of 6321409 is about 184.9004480215.

The spelling of 6321409 in words is "six million, three hundred twenty-one thousand, four hundred nine".