5081891 has 4 divisors (see below), whose sum is σ = 5094384. Its totient is φ = 5069400.

The previous prime is 5081837. The next prime is 5081893. The reversal of 5081891 is 1981805.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5081891 is a prime.

It is a super-2 number, since 2×5081891² = 51651232271762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5081893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5615 + ... + 6456.

It is an arithmetic number, because the mean of its divisors is an integer number (1273596).

Almost surely, 2^5081891 is an apocalyptic number.

5081891 is a deficient number, since it is larger than the sum of its proper divisors (12493).

5081891 is a wasteful number, since it uses less digits than its factorization.

5081891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12492.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 5081891 is about 2254.3049926751. The cubic root of 5081891 is about 171.9260882180.

The spelling of 5081891 in words is "five million, eighty-one thousand, eight hundred ninety-one".