135726581 has 2 divisors, whose sum is σ = 135726582. Its totient is φ = 135726580.

The previous prime is 135726559. The next prime is 135726593. The reversal of 135726581 is 185627531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131560900 + 4165681 = 11470^2 + 2041^2 .

It is an emirp because it is prime and its reverse (185627531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135726581 is a prime.

It is a super-2 number, since 2×135726581² = 36843409579899122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135726541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67863290 + 67863291.

It is an arithmetic number, because the mean of its divisors is an integer number (67863291).

Almost surely, 2^135726581 is an apocalyptic number.

It is an amenable number.

135726581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135726581 is an equidigital number, since it uses as much as digits as its factorization.

135726581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

The square root of 135726581 is about 11650.1751488980. The cubic root of 135726581 is about 513.9114608254.

The spelling of 135726581 in words is "one hundred thirty-five million, seven hundred twenty-six thousand, five hundred eighty-one".