11817617309 has 2 divisors, whose sum is σ = 11817617310. Its totient is φ = 11817617308.

The previous prime is 11817617299. The next prime is 11817617351. The reversal of 11817617309 is 90371671811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6985282084 + 4832335225 = 83578^2 + 69515^2 .

It is a cyclic number.

It is not a de Polignac number, because 11817617309 - 2³² = 7522650013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11817617309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11817617209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5908808654 + 5908808655.

It is an arithmetic number, because the mean of its divisors is an integer number (5908808655).

Almost surely, 2^11817617309 is an apocalyptic number.

It is an amenable number.

11817617309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11817617309 is an equidigital number, since it uses as much as digits as its factorization.

11817617309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 44.

The spelling of 11817617309 in words is "eleven billion, eight hundred seventeen million, six hundred seventeen thousand, three hundred nine".