109431218 has 18 divisors (see below), whose sum is σ = 178057719. Its totient is φ = 50417952.

The previous prime is 109431211. The next prime is 109431221. The reversal of 109431218 is 812134901.

It can be written as a sum of positive squares in 5 ways, for example, as 82369 + 109348849 = 287^2 + 10457^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7397.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109431211) 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 8 ways as a sum of consecutive naturals, for example, 192038 + ... + 192606.

Almost surely, 2^109431218 is an apocalyptic number.

109431218 is a deficient number, since it is larger than the sum of its proper divisors (68626501).

109431218 is an frugal number, since it uses more digits than its factorization.

109431218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 584 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 109431218 is about 10460.9377208738. The cubic root of 109431218 is about 478.3147177848.

The spelling of 109431218 in words is "one hundred nine million, four hundred thirty-one thousand, two hundred eighteen".