6421967 has 2 divisors, whose sum is σ = 6421968. Its totient is φ = 6421966.

The previous prime is 6421931. The next prime is 6421997. The reversal of 6421967 is 7691246.

6421967 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6421967 - 2²⁰ = 5373391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6421907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210983 + 3210984.

It is an arithmetic number, because the mean of its divisors is an integer number (3210984).

Almost surely, 2^6421967 is an apocalyptic number.

6421967 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421967 is an equidigital number, since it uses as much as digits as its factorization.

6421967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 6421967 is about 2534.1600186255. The cubic root of 6421967 is about 185.8757311526.

The spelling of 6421967 in words is "six million, four hundred twenty-one thousand, nine hundred sixty-seven".