7993833821 has 2 divisors, whose sum is σ = 7993833822. Its totient is φ = 7993833820.

The previous prime is 7993833791. The next prime is 7993833893. The reversal of 7993833821 is 1283383997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4759068196 + 3234765625 = 68986^2 + 56875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7993833821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7993830821) 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, 3996916910 + 3996916911.

It is an arithmetic number, because the mean of its divisors is an integer number (3996916911).

Almost surely, 2^7993833821 is an apocalyptic number.

It is an amenable number.

7993833821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7993833821 is an equidigital number, since it uses as much as digits as its factorization.

7993833821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 53.

The square root of 7993833821 is about 89408.2424667883. The cubic root of 7993833821 is about 1999.4860196734.

The spelling of 7993833821 in words is "seven billion, nine hundred ninety-three million, eight hundred thirty-three thousand, eight hundred twenty-one".