109408386509 has 2 divisors, whose sum is σ = 109408386510. Its totient is φ = 109408386508.

The previous prime is 109408386499. The next prime is 109408386511. The reversal of 109408386509 is 905683804901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84610010884 + 24798375625 = 290878^2 + 157475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109408386509 is a prime.

Together with 109408386511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109408386559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54704193254 + 54704193255.

It is an arithmetic number, because the mean of its divisors is an integer number (54704193255).

Almost surely, 2^109408386509 is an apocalyptic number.

It is an amenable number.

109408386509 is a deficient number, since it is larger than the sum of its proper divisors (1).

109408386509 is an equidigital number, since it uses as much as digits as its factorization.

109408386509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 109408386509 in words is "one hundred nine billion, four hundred eight million, three hundred eighty-six thousand, five hundred nine".