6379621 has 2 divisors, whose sum is σ = 6379622. Its totient is φ = 6379620.

The previous prime is 6379619. The next prime is 6379691. The reversal of 6379621 is 1269736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5904900 + 474721 = 2430^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6379621 - 2¹ = 6379619 is a prime.

Together with 6379619, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6379601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3189810 + 3189811.

It is an arithmetic number, because the mean of its divisors is an integer number (3189811).

Almost surely, 2^6379621 is an apocalyptic number.

It is an amenable number.

6379621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6379621 is an equidigital number, since it uses as much as digits as its factorization.

6379621 is an evil number, because the sum of its binary digits is even.

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

The square root of 6379621 is about 2525.7911631804. The cubic root of 6379621 is about 185.4662793523.

The spelling of 6379621 in words is "six million, three hundred seventy-nine thousand, six hundred twenty-one".