6909939791 has 2 divisors, whose sum is σ = 6909939792. Its totient is φ = 6909939790.

The previous prime is 6909939763. The next prime is 6909939793. The reversal of 6909939791 is 1979399096.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6909939791 - 2¹⁰ = 6909938767 is a prime.

Together with 6909939793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6909939793) 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 as a sum of consecutive naturals, namely, 3454969895 + 3454969896.

It is an arithmetic number, because the mean of its divisors is an integer number (3454969896).

Almost surely, 2^6909939791 is an apocalyptic number.

6909939791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6909939791 is an equidigital number, since it uses as much as digits as its factorization.

6909939791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7440174, while the sum is 62.

The square root of 6909939791 is about 83126.0476084362. The cubic root of 6909939791 is about 1904.6919855729.

The spelling of 6909939791 in words is "six billion, nine hundred nine million, nine hundred thirty-nine thousand, seven hundred ninety-one".