108211891 has 4 divisors (see below), whose sum is σ = 108252000. Its totient is φ = 108171784.

The previous prime is 108211879. The next prime is 108211967. The reversal of 108211891 is 198112801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198112801 = 643 ⋅308107.

It is a cyclic number.

It is not a de Polignac number, because 108211891 - 2²¹ = 106114739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108211801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15691 + ... + 21508.

It is an arithmetic number, because the mean of its divisors is an integer number (27063000).

Almost surely, 2^108211891 is an apocalyptic number.

108211891 is a deficient number, since it is larger than the sum of its proper divisors (40109).

108211891 is an equidigital number, since it uses as much as digits as its factorization.

108211891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40108.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 108211891 is about 10402.4944604648. The cubic root of 108211891 is about 476.5315528721.

The spelling of 108211891 in words is "one hundred eight million, two hundred eleven thousand, eight hundred ninety-one".