6621379 has 2 divisors, whose sum is σ = 6621380. Its totient is φ = 6621378.

The previous prime is 6621371. The next prime is 6621413. The reversal of 6621379 is 9731266.

It is an a-pointer prime, because the next prime (6621413) can be obtained adding 6621379 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6621379 - 2³ = 6621371 is a prime.

It is not a weakly prime, because it can be changed into another prime (6621371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310689 + 3310690.

It is an arithmetic number, because the mean of its divisors is an integer number (3310690).

Almost surely, 2^6621379 is an apocalyptic number.

6621379 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621379 is an equidigital number, since it uses as much as digits as its factorization.

6621379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 6621379 is about 2573.2040338846. The cubic root of 6621379 is about 187.7800638381.

The spelling of 6621379 in words is "six million, six hundred twenty-one thousand, three hundred seventy-nine".