109166161 has 4 divisors (see below), whose sum is σ = 117563572. Its totient is φ = 100768752.

The previous prime is 109166137. The next prime is 109166177. The reversal of 109166161 is 161661901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161661901 = 1087 ⋅148723.

It can be written as a sum of positive squares in 2 ways, for example, as 67486225 + 41679936 = 8215^2 + 6456^2 .

It is a cyclic number.

It is not a de Polignac number, because 109166161 - 2⁷ = 109166033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109166261) 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 3 ways as a sum of consecutive naturals, for example, 4198686 + ... + 4198711.

It is an arithmetic number, because the mean of its divisors is an integer number (29390893).

Almost surely, 2^109166161 is an apocalyptic number.

It is an amenable number.

109166161 is a deficient number, since it is larger than the sum of its proper divisors (8397411).

109166161 is an equidigital number, since it uses as much as digits as its factorization.

109166161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8397410.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 109166161 is about 10448.2611471957. The cubic root of 109166161 is about 477.9282248981.

The spelling of 109166161 in words is "one hundred nine million, one hundred sixty-six thousand, one hundred sixty-one".