131801717 has 2 divisors, whose sum is σ = 131801718. Its totient is φ = 131801716.

The previous prime is 131801713. The next prime is 131801729. The reversal of 131801717 is 717108131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113018161 + 18783556 = 10631^2 + 4334^2 .

It is a cyclic number.

It is not a de Polignac number, because 131801717 - 2² = 131801713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131801717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131801713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65900858 + 65900859.

It is an arithmetic number, because the mean of its divisors is an integer number (65900859).

Almost surely, 2^131801717 is an apocalyptic number.

It is an amenable number.

131801717 is a deficient number, since it is larger than the sum of its proper divisors (1).

131801717 is an equidigital number, since it uses as much as digits as its factorization.

131801717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 29.

The square root of 131801717 is about 11480.4928901158. The cubic root of 131801717 is about 508.9092631631.

Adding to 131801717 its reverse (717108131), we get a palindrome (848909848).

The spelling of 131801717 in words is "one hundred thirty-one million, eight hundred one thousand, seven hundred seventeen".