109909891 has 24 divisors (see below), whose sum is σ = 138919200. Its totient is φ = 86407776.

The previous prime is 109909883. The next prime is 109909901. The reversal of 109909891 is 198909901.

It is not a de Polignac number, because 109909891 - 2³ = 109909883 is a prime.

109909891 is a modest number, since divided by 9891 gives 1099 as remainder.

It is not an unprimeable number, because it can be changed into a prime (109909691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 699985 + ... + 700141.

It is an arithmetic number, because the mean of its divisors is an integer number (5788300).

Almost surely, 2^109909891 is an apocalyptic number.

109909891 is a deficient number, since it is larger than the sum of its proper divisors (29009309).

109909891 is an frugal number, since it uses more digits than its factorization.

109909891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 109909891 is about 10483.7918235722. The cubic root of 109909891 is about 479.0111166159.

The spelling of 109909891 in words is "one hundred nine million, nine hundred nine thousand, eight hundred ninety-one".