6920383991 has 2 divisors, whose sum is σ = 6920383992. Its totient is φ = 6920383990.

The previous prime is 6920383979. The next prime is 6920384069. The reversal of 6920383991 is 1993830296.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6920383991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6920383931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460191995 + 3460191996.

It is an arithmetic number, because the mean of its divisors is an integer number (3460191996).

Almost surely, 2^6920383991 is an apocalyptic number.

6920383991 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920383991 is an equidigital number, since it uses as much as digits as its factorization.

6920383991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 6920383991 is about 83188.8453520062. The cubic root of 6920383991 is about 1905.6511338174.

The spelling of 6920383991 in words is "six billion, nine hundred twenty million, three hundred eighty-three thousand, nine hundred ninety-one".