4721968891 has 2 divisors, whose sum is σ = 4721968892. Its totient is φ = 4721968890.

The previous prime is 4721968883. The next prime is 4721968907. The reversal of 4721968891 is 1988691274.

It is a happy number.

4721968891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4721968891 - 2³ = 4721968883 is a prime.

It is not a weakly prime, because it can be changed into another prime (4721968831) 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, 2360984445 + 2360984446.

It is an arithmetic number, because the mean of its divisors is an integer number (2360984446).

Almost surely, 2^4721968891 is an apocalyptic number.

4721968891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4721968891 is an equidigital number, since it uses as much as digits as its factorization.

4721968891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 55.

The square root of 4721968891 is about 68716.5838135162. The cubic root of 4721968891 is about 1677.6745143427.

The spelling of 4721968891 in words is "four billion, seven hundred twenty-one million, nine hundred sixty-eight thousand, eight hundred ninety-one".