4881051991 has 4 divisors (see below), whose sum is σ = 4994564872. Its totient is φ = 4767539112.

The previous prime is 4881051919. The next prime is 4881051997. The reversal of 4881051991 is 1991501884.

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

It is a cyclic number.

It is not a de Polignac number, because 4881051991 - 2¹⁹ = 4880527703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4881051997) 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 in 3 ways as a sum of consecutive naturals, for example, 56756376 + ... + 56756461.

It is an arithmetic number, because the mean of its divisors is an integer number (1248641218).

Almost surely, 2^4881051991 is an apocalyptic number.

4881051991 is a deficient number, since it is larger than the sum of its proper divisors (113512881).

4881051991 is a wasteful number, since it uses less digits than its factorization.

4881051991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113512880.

The product of its (nonzero) digits is 103680, while the sum is 46.

The square root of 4881051991 is about 69864.5259842218. The cubic root of 4881051991 is about 1696.3070922453.

The spelling of 4881051991 in words is "four billion, eight hundred eighty-one million, fifty-one thousand, nine hundred ninety-one".