103218891 has 4 divisors (see below), whose sum is σ = 137625192. Its totient is φ = 68812592.

The previous prime is 103218889. The next prime is 103218923. The reversal of 103218891 is 198812301.

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

It is a cyclic number.

It is not a de Polignac number, because 103218891 - 2¹ = 103218889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (103218091) 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 3 ways as a sum of consecutive naturals, for example, 17203146 + ... + 17203151.

It is an arithmetic number, because the mean of its divisors is an integer number (34406298).

Almost surely, 2^103218891 is an apocalyptic number.

103218891 is a deficient number, since it is larger than the sum of its proper divisors (34406301).

103218891 is an equidigital number, since it uses as much as digits as its factorization.

103218891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34406300.

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

The square root of 103218891 is about 10159.6698273123. The cubic root of 103218891 is about 469.0866387496.

The spelling of 103218891 in words is "one hundred three million, two hundred eighteen thousand, eight hundred ninety-one".