109161905 has 8 divisors (see below), whose sum is σ = 131616384. Its totient is φ = 86914800.

The previous prime is 109161901. The next prime is 109161917. The reversal of 109161905 is 509161901.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 109161905 - 2² = 109161901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109161901) 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 7 ways as a sum of consecutive naturals, for example, 50681 + ... + 52790.

It is an arithmetic number, because the mean of its divisors is an integer number (16452048).

Almost surely, 2^109161905 is an apocalyptic number.

It is an amenable number.

109161905 is a deficient number, since it is larger than the sum of its proper divisors (22454479).

109161905 is a wasteful number, since it uses less digits than its factorization.

109161905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103687.

The product of its (nonzero) digits is 2430, while the sum is 32.

The square root of 109161905 is about 10448.0574749568. The cubic root of 109161905 is about 477.9220139107.

It can be divided in two parts, 10916 and 1905, that added together give a palindrome (12821).

The spelling of 109161905 in words is "one hundred nine million, one hundred sixty-one thousand, nine hundred five".