109681985 has 16 divisors (see below), whose sum is σ = 150633216. Its totient is φ = 75104448.

The previous prime is 109681967. The next prime is 109681993. The reversal of 109681985 is 589186901.

It is a cyclic number.

It is not a de Polignac number, because 109681985 - 2²⁰ = 108633409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29279 + ... + 32811.

It is an arithmetic number, because the mean of its divisors is an integer number (9414576).

Almost surely, 2^109681985 is an apocalyptic number.

It is an amenable number.

109681985 is a deficient number, since it is larger than the sum of its proper divisors (40951231).

109681985 is an equidigital number, since it uses as much as digits as its factorization.

109681985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 109681985 is about 10472.9167379484. The cubic root of 109681985 is about 478.6797995994.

The spelling of 109681985 in words is "one hundred nine million, six hundred eighty-one thousand, nine hundred eighty-five".