108945409 has 2 divisors, whose sum is σ = 108945410. Its totient is φ = 108945408.

The previous prime is 108945379. The next prime is 108945413. The reversal of 108945409 is 904549801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92160000 + 16785409 = 9600^2 + 4097^2 .

It is an emirp because it is prime and its reverse (904549801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108945409 - 2⁹ = 108944897 is a prime.

It is not a weakly prime, because it can be changed into another prime (108945479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54472704 + 54472705.

It is an arithmetic number, because the mean of its divisors is an integer number (54472705).

Almost surely, 2^108945409 is an apocalyptic number.

It is an amenable number.

108945409 is a deficient number, since it is larger than the sum of its proper divisors (1).

108945409 is an equidigital number, since it uses as much as digits as its factorization.

108945409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 108945409 is about 10437.6917467417. The cubic root of 108945409 is about 477.6058575828.

The spelling of 108945409 in words is "one hundred eight million, nine hundred forty-five thousand, four hundred nine".