6721859 has 2 divisors, whose sum is σ = 6721860. Its totient is φ = 6721858.

The previous prime is 6721849. The next prime is 6721861. The reversal of 6721859 is 9581276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721859 - 2⁴ = 6721843 is a prime.

Together with 6721861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6721849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360929 + 3360930.

It is an arithmetic number, because the mean of its divisors is an integer number (3360930).

Almost surely, 2^6721859 is an apocalyptic number.

6721859 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721859 is an equidigital number, since it uses as much as digits as its factorization.

6721859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 6721859 is about 2592.6548169781. The cubic root of 6721859 is about 188.7251587851.

The spelling of 6721859 in words is "six million, seven hundred twenty-one thousand, eight hundred fifty-nine".