109578109 has 2 divisors, whose sum is σ = 109578110. Its totient is φ = 109578108.

The previous prime is 109578101. The next prime is 109578167. The reversal of 109578109 is 901875901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64352484 + 45225625 = 8022^2 + 6725^2 .

It is a cyclic number.

It is not a de Polignac number, because 109578109 - 2³ = 109578101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109578101) 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 as a sum of consecutive naturals, namely, 54789054 + 54789055.

It is an arithmetic number, because the mean of its divisors is an integer number (54789055).

Almost surely, 2^109578109 is an apocalyptic number.

It is an amenable number.

109578109 is a deficient number, since it is larger than the sum of its proper divisors (1).

109578109 is an equidigital number, since it uses as much as digits as its factorization.

109578109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 109578109 is about 10467.9562952851. The cubic root of 109578109 is about 478.5286381964.

The spelling of 109578109 in words is "one hundred nine million, five hundred seventy-eight thousand, one hundred nine".