109181609 has 2 divisors, whose sum is σ = 109181610. Its totient is φ = 109181608.

The previous prime is 109181573. The next prime is 109181627. The reversal of 109181609 is 906181901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99940009 + 9241600 = 9997^2 + 3040^2 .

It is a cyclic number.

It is not a de Polignac number, because 109181609 - 2²⁴ = 92404393 is a prime.

It is not a weakly prime, because it can be changed into another prime (109181629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54590804 + 54590805.

It is an arithmetic number, because the mean of its divisors is an integer number (54590805).

Almost surely, 2^109181609 is an apocalyptic number.

It is an amenable number.

109181609 is a deficient number, since it is larger than the sum of its proper divisors (1).

109181609 is an equidigital number, since it uses as much as digits as its factorization.

109181609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 109181609 is about 10449.0003828117. Note that the first 3 decimals coincide. The cubic root of 109181609 is about 477.9507675583.

The spelling of 109181609 in words is "one hundred nine million, one hundred eighty-one thousand, six hundred nine".