131668717 has 2 divisors, whose sum is σ = 131668718. Its totient is φ = 131668716.

The previous prime is 131668703. The next prime is 131668739. The reversal of 131668717 is 717866131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78393316 + 53275401 = 8854^2 + 7299^2 .

It is an emirp because it is prime and its reverse (717866131) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131668717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131668717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131668777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65834358 + 65834359.

It is an arithmetic number, because the mean of its divisors is an integer number (65834359).

Almost surely, 2^131668717 is an apocalyptic number.

It is an amenable number.

131668717 is a deficient number, since it is larger than the sum of its proper divisors (1).

131668717 is an equidigital number, since it uses as much as digits as its factorization.

131668717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 131668717 is about 11474.6989938734. The cubic root of 131668717 is about 508.7380268720.

The spelling of 131668717 in words is "one hundred thirty-one million, six hundred sixty-eight thousand, seven hundred seventeen".