6711521 has 2 divisors, whose sum is σ = 6711522. Its totient is φ = 6711520.

The previous prime is 6711511. The next prime is 6711533. The reversal of 6711521 is 1251176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 2217121 = 2120^2 + 1489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6711521 is a prime.

It is not a weakly prime, because it can be changed into another prime (6711511) 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, 3355760 + 3355761.

It is an arithmetic number, because the mean of its divisors is an integer number (3355761).

Almost surely, 2^6711521 is an apocalyptic number.

It is an amenable number.

6711521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6711521 is an equidigital number, since it uses as much as digits as its factorization.

6711521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 23.

The square root of 6711521 is about 2590.6603405310. The cubic root of 6711521 is about 188.6283580955.

Adding to 6711521 its reverse (1251176), we get a palindrome (7962697).

The spelling of 6711521 in words is "six million, seven hundred eleven thousand, five hundred twenty-one".