6718561 has 2 divisors, whose sum is σ = 6718562. Its totient is φ = 6718560.

The previous prime is 6718541. The next prime is 6718567. The reversal of 6718561 is 1658176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3763600 + 2954961 = 1940^2 + 1719^2 .

It is a cyclic number.

It is not a de Polignac number, because 6718561 - 2¹³ = 6710369 is a prime.

It is not a weakly prime, because it can be changed into another prime (6718567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3359280 + 3359281.

It is an arithmetic number, because the mean of its divisors is an integer number (3359281).

Almost surely, 2^6718561 is an apocalyptic number.

It is an amenable number.

6718561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6718561 is an equidigital number, since it uses as much as digits as its factorization.

6718561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

The square root of 6718561 is about 2592.0187113522. The cubic root of 6718561 is about 188.6942884859.

The spelling of 6718561 in words is "six million, seven hundred eighteen thousand, five hundred sixty-one".