135508081 has 4 divisors (see below), whose sum is σ = 135862272. Its totient is φ = 135153892.

The previous prime is 135508033. The next prime is 135508151. The reversal of 135508081 is 180805531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180805531 = 41 ⋅4409891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135508081 is a prime.

It is a super-2 number, since 2×135508081² = 36724880032605122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135508001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176521 + ... + 177286.

It is an arithmetic number, because the mean of its divisors is an integer number (33965568).

Almost surely, 2^135508081 is an apocalyptic number.

It is an amenable number.

135508081 is a deficient number, since it is larger than the sum of its proper divisors (354191).

135508081 is an equidigital number, since it uses as much as digits as its factorization.

135508081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354190.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 135508081 is about 11640.7938303193. The cubic root of 135508081 is about 513.6355385411.

Adding to 135508081 its product of nonzero digits (4800), we get a square (135512881 = 11641²).

The spelling of 135508081 in words is "one hundred thirty-five million, five hundred eight thousand, eighty-one".