6726991 has 2 divisors, whose sum is σ = 6726992. Its totient is φ = 6726990.

The previous prime is 6726989. The next prime is 6727009. The reversal of 6726991 is 1996276.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6726991 - 2¹ = 6726989 is a prime.

Together with 6726989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6726961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3363495 + 3363496.

It is an arithmetic number, because the mean of its divisors is an integer number (3363496).

Almost surely, 2^6726991 is an apocalyptic number.

6726991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6726991 is an equidigital number, since it uses as much as digits as its factorization.

6726991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 6726991 is about 2593.6443472458. The cubic root of 6726991 is about 188.7731758160.

The spelling of 6726991 in words is "six million, seven hundred twenty-six thousand, nine hundred ninety-one".