5287891 has 4 divisors (see below), whose sum is σ = 6043312. Its totient is φ = 4532472.

The previous prime is 5287879. The next prime is 5287897. The reversal of 5287891 is 1987825.

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

It is not a de Polignac number, because 5287891 - 2⁵ = 5287859 is a prime.

It is a super-3 number, since 3×5287891³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

5287891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5287897) 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, 377700 + ... + 377713.

It is an arithmetic number, because the mean of its divisors is an integer number (1510828).

Almost surely, 2^5287891 is an apocalyptic number.

5287891 is a deficient number, since it is larger than the sum of its proper divisors (755421).

5287891 is an equidigital number, since it uses as much as digits as its factorization.

5287891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755420.

The product of its digits is 40320, while the sum is 40.

The square root of 5287891 is about 2299.5414760339. The cubic root of 5287891 is about 174.2184577197.

The spelling of 5287891 in words is "five million, two hundred eighty-seven thousand, eight hundred ninety-one".