135680317 has 2 divisors, whose sum is σ = 135680318. Its totient is φ = 135680316.

The previous prime is 135680291. The next prime is 135680329. The reversal of 135680317 is 713086531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129299641 + 6380676 = 11371^2 + 2526^2 .

It is an emirp because it is prime and its reverse (713086531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135680317 - 2²⁷ = 1462589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135681317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67840158 + 67840159.

It is an arithmetic number, because the mean of its divisors is an integer number (67840159).

Almost surely, 2^135680317 is an apocalyptic number.

It is an amenable number.

135680317 is a deficient number, since it is larger than the sum of its proper divisors (1).

135680317 is an equidigital number, since it uses as much as digits as its factorization.

135680317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 135680317 is about 11648.1894301217. The cubic root of 135680317 is about 513.8530632697.

The spelling of 135680317 in words is "one hundred thirty-five million, six hundred eighty thousand, three hundred seventeen".