4891128481 has 4 divisors (see below), whose sum is σ = 4891821700. Its totient is φ = 4890435264.

The previous prime is 4891128433. The next prime is 4891128491. The reversal of 4891128481 is 1848211984.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3898878481 + 992250000 = 62441^2 + 31500^2 .

It is a cyclic number.

It is not a de Polignac number, because 4891128481 - 2¹⁹ = 4890604193 is a prime.

It is a super-2 number, since 2×4891128481² = 47846275635298734722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4891128491) 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 in 3 ways as a sum of consecutive naturals, for example, 335916 + ... + 350173.

It is an arithmetic number, because the mean of its divisors is an integer number (1222955425).

Almost surely, 2^4891128481 is an apocalyptic number.

It is an amenable number.

4891128481 is a deficient number, since it is larger than the sum of its proper divisors (693219).

4891128481 is an equidigital number, since it uses as much as digits as its factorization.

4891128481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693218.

The product of its digits is 147456, while the sum is 46.

The square root of 4891128481 is about 69936.6032989879. The cubic root of 4891128481 is about 1697.4735807237.

The spelling of 4891128481 in words is "four billion, eight hundred ninety-one million, one hundred twenty-eight thousand, four hundred eighty-one".