135811 has 8 divisors (see below), whose sum is σ = 151424. Its totient is φ = 120960.

The previous prime is 135799. The next prime is 135829. The reversal of 135811 is 118531.

135811 = T₁₃₈ + T₁₃₉ + ... + T₁₅₀.

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

It is a cyclic number.

It is not a de Polignac number, because 135811 - 2¹⁵ = 103043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135841) 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, 235 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (18928).

2¹³⁵⁸¹¹ is an apocalyptic number.

135811 is a deficient number, since it is larger than the sum of its proper divisors (15613).

135811 is a wasteful number, since it uses less digits than its factorization.

135811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its digits is 120, while the sum is 19.

The square root of 135811 is about 368.5254400988. The cubic root of 135811 is about 51.4017986017.

It can be divided in two parts, 1358 and 11, that added together give a square (1369 = 37²).

The spelling of 135811 in words is "one hundred thirty-five thousand, eight hundred eleven".