218103891 has 8 divisors (see below), whose sum is σ = 290907600. Its totient is φ = 145351392.

The previous prime is 218103859. The next prime is 218103901. The reversal of 218103891 is 198301812.

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

It is not a de Polignac number, because 218103891 - 2⁵ = 218103859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218103811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416 + ... + 20933.

It is an arithmetic number, because the mean of its divisors is an integer number (36363450).

Almost surely, 2^218103891 is an apocalyptic number.

218103891 is a deficient number, since it is larger than the sum of its proper divisors (72803709).

218103891 is a wasteful number, since it uses less digits than its factorization.

218103891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 218103891 is about 14768.3408343659. The cubic root of 218103891 is about 601.9417564134.

The spelling of 218103891 in words is "two hundred eighteen million, one hundred three thousand, eight hundred ninety-one".