5181891 has 32 divisors (see below), whose sum is σ = 8322048. Its totient is φ = 2826240.

The previous prime is 5181881. The next prime is 5181893. The reversal of 5181891 is 1981815.

It is not a de Polignac number, because 5181891 - 2⁵ = 5181859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (5181893) 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 31 ways as a sum of consecutive naturals, for example, 20035 + ... + 20291.

It is an arithmetic number, because the mean of its divisors is an integer number (260064).

Almost surely, 2^5181891 is an apocalyptic number.

5181891 is a deficient number, since it is larger than the sum of its proper divisors (3140157).

5181891 is a wasteful number, since it uses less digits than its factorization.

5181891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331.

The product of its digits is 2880, while the sum is 33.

The square root of 5181891 is about 2276.3767262911. The cubic root of 5181891 is about 173.0464753125.

The spelling of 5181891 in words is "five million, one hundred eighty-one thousand, eight hundred ninety-one".