135759581 has 2 divisors, whose sum is σ = 135759582. Its totient is φ = 135759580.

The previous prime is 135759521. The next prime is 135759583. The reversal of 135759581 is 185957531.

It is a happy number.

135759581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135256900 + 502681 = 11630^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 135759581 - 2⁶ = 135759517 is a prime.

It is a super-2 number, since 2×135759581² = 36861327666591122, which contains 22 as substring.

Together with 135759583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135759583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67879790 + 67879791.

It is an arithmetic number, because the mean of its divisors is an integer number (67879791).

Almost surely, 2^135759581 is an apocalyptic number.

It is an amenable number.

135759581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135759581 is an equidigital number, since it uses as much as digits as its factorization.

135759581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 44.

The square root of 135759581 is about 11651.5913505409. The cubic root of 135759581 is about 513.9531075532.

The spelling of 135759581 in words is "one hundred thirty-five million, seven hundred fifty-nine thousand, five hundred eighty-one".