6681013 has 2 divisors, whose sum is σ = 6681014. Its totient is φ = 6681012.

The previous prime is 6681001. The next prime is 6681019. The reversal of 6681013 is 3101866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5793649 + 887364 = 2407^2 + 942^2 .

It is a cyclic number.

It is not a de Polignac number, because 6681013 - 2⁵ = 6680981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6681019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340506 + 3340507.

It is an arithmetic number, because the mean of its divisors is an integer number (3340507).

Almost surely, 2^6681013 is an apocalyptic number.

It is an amenable number.

6681013 is a deficient number, since it is larger than the sum of its proper divisors (1).

6681013 is an equidigital number, since it uses as much as digits as its factorization.

6681013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 6681013 is about 2584.7655599686. The cubic root of 6681013 is about 188.3421132166.

Adding to 6681013 its reverse (3101866), we get a palindrome (9782879).

It can be divided in two parts, 668 and 1013, that added together give a square (1681 = 41²).

The spelling of 6681013 in words is "six million, six hundred eighty-one thousand, thirteen".