6891891307 has 12 divisors (see below), whose sum is σ = 8488693080. Its totient is φ = 5559844416.

The previous prime is 6891891289. The next prime is 6891891313. The reversal of 6891891307 is 7031981986.

It is a happy number.

It is not a de Polignac number, because 6891891307 - 2⁷ = 6891891179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6891891007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4135957 + ... + 4137622.

It is an arithmetic number, because the mean of its divisors is an integer number (707391090).

Almost surely, 2^6891891307 is an apocalyptic number.

6891891307 is a deficient number, since it is larger than the sum of its proper divisors (1596801773).

6891891307 is a wasteful number, since it uses less digits than its factorization.

6891891307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273610 (or 8273603 counting only the distinct ones).

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

The square root of 6891891307 is about 83017.4156849031. The cubic root of 6891891307 is about 1903.0322134355.

The spelling of 6891891307 in words is "six billion, eight hundred ninety-one million, eight hundred ninety-one thousand, three hundred seven".