135775581 has 8 divisors (see below), whose sum is σ = 181334784. Its totient is φ = 90366720.

The previous prime is 135775561. The next prime is 135775603. The reversal of 135775581 is 185577531.

135775581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135775581 - 2⁶ = 135775517 is a prime.

It is a super-2 number, since 2×135775581² = 36870016791775122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135775561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35460 + ... + 39101.

It is an arithmetic number, because the mean of its divisors is an integer number (22666848).

Almost surely, 2^135775581 is an apocalyptic number.

It is an amenable number.

135775581 is a deficient number, since it is larger than the sum of its proper divisors (45559203).

135775581 is an equidigital number, since it uses as much as digits as its factorization.

135775581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75171.

The product of its digits is 147000, while the sum is 42.

The square root of 135775581 is about 11652.2779318037. The cubic root of 135775581 is about 513.9732974768.

The spelling of 135775581 in words is "one hundred thirty-five million, seven hundred seventy-five thousand, five hundred eighty-one".