6723641 has 2 divisors, whose sum is σ = 6723642. Its totient is φ = 6723640.

The previous prime is 6723637. The next prime is 6723643. The reversal of 6723641 is 1463276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5271616 + 1452025 = 2296^2 + 1205^2 .

It is a cyclic number.

It is not a de Polignac number, because 6723641 - 2² = 6723637 is a prime.

Together with 6723643, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 6 + 7⁸ + 2¹⁷ + 3¹² + 6⁷ + 4⁷ + 1 .

It is not a weakly prime, because it can be changed into another prime (6723643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3361820 + 3361821.

It is an arithmetic number, because the mean of its divisors is an integer number (3361821).

Almost surely, 2^6723641 is an apocalyptic number.

It is an amenable number.

6723641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6723641 is an equidigital number, since it uses as much as digits as its factorization.

6723641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 6723641 is about 2592.9984573848. The cubic root of 6723641 is about 188.7418346540.

The spelling of 6723641 in words is "six million, seven hundred twenty-three thousand, six hundred forty-one".