109561985 has 16 divisors (see below), whose sum is σ = 143055696. Its totient is φ = 80068608.

The previous prime is 109561973. The next prime is 109562003. The reversal of 109561985 is 589165901.

It can be written as a sum of positive squares in 8 ways, for example, as 30991489 + 78570496 = 5567^2 + 8864^2 .

It is a cyclic number.

It is not a de Polignac number, because 109561985 - 2⁸ = 109561729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2384 + ... + 14993.

It is an arithmetic number, because the mean of its divisors is an integer number (8940981).

Almost surely, 2^109561985 is an apocalyptic number.

It is an amenable number.

109561985 is a deficient number, since it is larger than the sum of its proper divisors (33493711).

109561985 is a wasteful number, since it uses less digits than its factorization.

109561985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17492.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 109561985 is about 10467.1861070681. The cubic root of 109561985 is about 478.5051658249.

The spelling of 109561985 in words is "one hundred nine million, five hundred sixty-one thousand, nine hundred eighty-five".