131687317 has 2 divisors, whose sum is σ = 131687318. Its totient is φ = 131687316.

The previous prime is 131687267. The next prime is 131687323. The reversal of 131687317 is 713786131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115799121 + 15888196 = 10761^2 + 3986^2 .

It is an emirp because it is prime and its reverse (713786131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131687317 - 2¹¹ = 131685269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131687377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65843658 + 65843659.

It is an arithmetic number, because the mean of its divisors is an integer number (65843659).

Almost surely, 2^131687317 is an apocalyptic number.

It is an amenable number.

131687317 is a deficient number, since it is larger than the sum of its proper divisors (1).

131687317 is an equidigital number, since it uses as much as digits as its factorization.

131687317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 131687317 is about 11475.5094440291. The cubic root of 131687317 is about 508.7619811364.

The spelling of 131687317 in words is "one hundred thirty-one million, six hundred eighty-seven thousand, three hundred seventeen".