6891908713 has 2 divisors, whose sum is σ = 6891908714. Its totient is φ = 6891908712.

The previous prime is 6891908687. The next prime is 6891908717. The reversal of 6891908713 is 3178091986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6883689024 + 8219689 = 82968^2 + 2867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6891908713 is a prime.

It is not a weakly prime, because it can be changed into another prime (6891908717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445954356 + 3445954357.

It is an arithmetic number, because the mean of its divisors is an integer number (3445954357).

Almost surely, 2^6891908713 is an apocalyptic number.

It is an amenable number.

6891908713 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891908713 is an equidigital number, since it uses as much as digits as its factorization.

6891908713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 6891908713 is about 83017.5205182617. The cubic root of 6891908713 is about 1903.0338155187.

The spelling of 6891908713 in words is "six billion, eight hundred ninety-one million, nine hundred eight thousand, seven hundred thirteen".