131366172617 has 2 divisors, whose sum is σ = 131366172618. Its totient is φ = 131366172616.

The previous prime is 131366172607. The next prime is 131366172671. The reversal of 131366172617 is 716271663131.

Together with next prime (131366172671) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131032416256 + 333756361 = 361984^2 + 18269^2 .

It is a cyclic number.

It is not a de Polignac number, because 131366172617 - 2²⁰ = 131365124041 is a prime.

It is not a weakly prime, because it can be changed into another prime (131366172607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65683086308 + 65683086309.

It is an arithmetic number, because the mean of its divisors is an integer number (65683086309).

Almost surely, 2^131366172617 is an apocalyptic number.

It is an amenable number.

131366172617 is a deficient number, since it is larger than the sum of its proper divisors (1).

131366172617 is an equidigital number, since it uses as much as digits as its factorization.

131366172617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The spelling of 131366172617 in words is "one hundred thirty-one billion, three hundred sixty-six million, one hundred seventy-two thousand, six hundred seventeen".