108135509 has 2 divisors, whose sum is σ = 108135510. Its totient is φ = 108135508.

The previous prime is 108135481. The next prime is 108135541. The reversal of 108135509 is 905531801.

It is an a-pointer prime, because the next prime (108135541) can be obtained adding 108135509 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105062500 + 3073009 = 10250^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108135509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108137509) 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, 54067754 + 54067755.

It is an arithmetic number, because the mean of its divisors is an integer number (54067755).

Almost surely, 2^108135509 is an apocalyptic number.

It is an amenable number.

108135509 is a deficient number, since it is larger than the sum of its proper divisors (1).

108135509 is an equidigital number, since it uses as much as digits as its factorization.

108135509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 108135509 is about 10398.8224814159. The cubic root of 108135509 is about 476.4194056145.

The spelling of 108135509 in words is "one hundred eight million, one hundred thirty-five thousand, five hundred nine".