6819999971 has 2 divisors, whose sum is σ = 6819999972. Its totient is φ = 6819999970.

The previous prime is 6819999959. The next prime is 6820000009. The reversal of 6819999971 is 1799999186.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6819999971 is a prime.

It is not a weakly prime, because it can be changed into another prime (6819999271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3409999985 + 3409999986.

It is an arithmetic number, because the mean of its divisors is an integer number (3409999986).

Almost surely, 2^6819999971 is an apocalyptic number.

6819999971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6819999971 is an equidigital number, since it uses as much as digits as its factorization.

6819999971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19840464, while the sum is 68.

The square root of 6819999971 is about 82583.2911126700. The cubic root of 6819999971 is about 1896.3920423845.

The spelling of 6819999971 in words is "six billion, eight hundred nineteen million, nine hundred ninety-nine thousand, nine hundred seventy-one".