135255591 has 12 divisors (see below), whose sum is σ = 195706368. Its totient is φ = 90014784.

The previous prime is 135255581. The next prime is 135255599. The reversal of 135255591 is 195552531.

135255591 is a `hidden beast` number, since 13 + 5 + 2 + 55 + 591 = 666.

135255591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135255591 - 2⁵ = 135255559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135255599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7335 + ... + 18008.

It is an arithmetic number, because the mean of its divisors is an integer number (16308864).

Almost surely, 2^135255591 is an apocalyptic number.

135255591 is a deficient number, since it is larger than the sum of its proper divisors (60450777).

135255591 is a wasteful number, since it uses less digits than its factorization.

135255591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25942 (or 25939 counting only the distinct ones).

The product of its digits is 33750, while the sum is 36.

The square root of 135255591 is about 11629.9437229937. The cubic root of 135255591 is about 513.3163239524.

The spelling of 135255591 in words is "one hundred thirty-five million, two hundred fifty-five thousand, five hundred ninety-one".