135307681 has 2 divisors, whose sum is σ = 135307682. Its totient is φ = 135307680.

The previous prime is 135307657. The next prime is 135307717. The reversal of 135307681 is 186703531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129504400 + 5803281 = 11380^2 + 2409^2 .

It is a cyclic number.

It is not a de Polignac number, because 135307681 - 2⁷ = 135307553 is a prime.

It is a super-2 number, since 2×135307681² = 36616337075195522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135307621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67653840 + 67653841.

It is an arithmetic number, because the mean of its divisors is an integer number (67653841).

Almost surely, 2^135307681 is an apocalyptic number.

It is an amenable number.

135307681 is a deficient number, since it is larger than the sum of its proper divisors (1).

135307681 is an equidigital number, since it uses as much as digits as its factorization.

135307681 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 135307681 is about 11632.1829851494. The cubic root of 135307681 is about 513.3822120864.

The spelling of 135307681 in words is "one hundred thirty-five million, three hundred seven thousand, six hundred eighty-one".