135771 has 8 divisors (see below), whose sum is σ = 182784. Its totient is φ = 89640.

The previous prime is 135757. The next prime is 135781. The reversal of 135771 is 177531.

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

It is not a de Polignac number, because 135771 - 2¹¹ = 133723 is a prime.

135771 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 135771.

It is not an unprimeable number, because it can be changed into a prime (135701) 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, 366 + ... + 636.

It is an arithmetic number, because the mean of its divisors is an integer number (22848).

2¹³⁵⁷⁷¹ is an apocalyptic number.

135771 is a deficient number, since it is larger than the sum of its proper divisors (47013).

135771 is a wasteful number, since it uses less digits than its factorization.

135771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441.

The product of its digits is 735, while the sum is 24.

The square root of 135771 is about 368.4711657647. The cubic root of 135771 is about 51.3967517011.

The spelling of 135771 in words is "one hundred thirty-five thousand, seven hundred seventy-one".