6946891921 has 2 divisors, whose sum is σ = 6946891922. Its totient is φ = 6946891920.

The previous prime is 6946891841. The next prime is 6946891927. The reversal of 6946891921 is 1291986496.

6946891921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6720720400 + 226171521 = 81980^2 + 15039^2 .

It is a cyclic number.

It is not a de Polignac number, because 6946891921 - 2⁷ = 6946891793 is a prime.

It is not a weakly prime, because it can be changed into another prime (6946891927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3473445960 + 3473445961.

It is an arithmetic number, because the mean of its divisors is an integer number (3473445961).

Almost surely, 2^6946891921 is an apocalyptic number.

It is an amenable number.

6946891921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6946891921 is an equidigital number, since it uses as much as digits as its factorization.

6946891921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 55.

The square root of 6946891921 is about 83348.0168990241. The cubic root of 6946891921 is about 1908.0811774982.

The spelling of 6946891921 in words is "six billion, nine hundred forty-six million, eight hundred ninety-one thousand, nine hundred twenty-one".