5243091891 has 8 divisors (see below), whose sum is σ = 7294736640. Its totient is φ = 3343420872.

The previous prime is 5243091883. The next prime is 5243091991. The reversal of 5243091891 is 1981903425.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5243091891 - 2³ = 5243091883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5243091811) 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 7 ways as a sum of consecutive naturals, for example, 37993351 + ... + 37993488.

It is an arithmetic number, because the mean of its divisors is an integer number (911842080).

Almost surely, 2^5243091891 is an apocalyptic number.

5243091891 is a deficient number, since it is larger than the sum of its proper divisors (2051644749).

5243091891 is a wasteful number, since it uses less digits than its factorization.

5243091891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75986865.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 5243091891 is about 72409.1975580451. The cubic root of 5243091891 is about 1737.2506776528.

The spelling of 5243091891 in words is "five billion, two hundred forty-three million, ninety-one thousand, eight hundred ninety-one".