135740681 has 2 divisors, whose sum is σ = 135740682. Its totient is φ = 135740680.

The previous prime is 135740669. The next prime is 135740701. The reversal of 135740681 is 186047531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94575625 + 41165056 = 9725^2 + 6416^2 .

It is an emirp because it is prime and its reverse (186047531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135740681 - 2²² = 131546377 is a prime.

It is a super-2 number, since 2×135740681² = 36851064956687522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135740611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67870340 + 67870341.

It is an arithmetic number, because the mean of its divisors is an integer number (67870341).

Almost surely, 2^135740681 is an apocalyptic number.

It is an amenable number.

135740681 is a deficient number, since it is larger than the sum of its proper divisors (1).

135740681 is an equidigital number, since it uses as much as digits as its factorization.

135740681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 135740681 is about 11650.7802742992. The cubic root of 135740681 is about 513.9292561622.

The spelling of 135740681 in words is "one hundred thirty-five million, seven hundred forty thousand, six hundred eighty-one".