109808891 has 2 divisors, whose sum is σ = 109808892. Its totient is φ = 109808890.

The previous prime is 109808869. The next prime is 109808927. The reversal of 109808891 is 198808901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109808891 - 2⁶ = 109808827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109808801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54904445 + 54904446.

It is an arithmetic number, because the mean of its divisors is an integer number (54904446).

Almost surely, 2^109808891 is an apocalyptic number.

109808891 is a deficient number, since it is larger than the sum of its proper divisors (1).

109808891 is an equidigital number, since it uses as much as digits as its factorization.

109808891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 109808891 is about 10478.9737570050. The cubic root of 109808891 is about 478.8643450218.

The spelling of 109808891 in words is "one hundred nine million, eight hundred eight thousand, eight hundred ninety-one".