6945081921 has 12 divisors (see below), whose sum is σ = 10033279360. Its totient is φ = 4629364920.

The previous prime is 6945081911. The next prime is 6945081937. The reversal of 6945081921 is 1291805496.

6945081921 is a `hidden beast` number, since 6 + 9 + 450 + 8 + 192 + 1 = 666.

It is not a de Polignac number, because 6945081921 - 2¹¹ = 6945079873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6945081901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10536 + ... + 118326.

Almost surely, 2^6945081921 is an apocalyptic number.

It is an amenable number.

6945081921 is a deficient number, since it is larger than the sum of its proper divisors (3088197439).

6945081921 is a wasteful number, since it uses less digits than its factorization.

6945081921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114956 (or 114953 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 6945081921 is about 83337.1581048934. The cubic root of 6945081921 is about 1907.9154474154.

The spelling of 6945081921 in words is "six billion, nine hundred forty-five million, eighty-one thousand, nine hundred twenty-one".