135831 has 8 divisors (see below), whose sum is σ = 190720. Its totient is φ = 85752.

The previous prime is 135829. The next prime is 135841. The reversal of 135831 is 138531.

It is a happy number.

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

It is not a de Polignac number, because 135831 - 2¹ = 135829 is a prime.

It is a super-2 number, since 2×135831² = 36900121122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135798 and 135807.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 135831.

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, 1135 + ... + 1248.

It is an arithmetic number, because the mean of its divisors is an integer number (23840).

2¹³⁵⁸³¹ is an apocalyptic number.

135831 is a deficient number, since it is larger than the sum of its proper divisors (54889).

135831 is a wasteful number, since it uses less digits than its factorization.

135831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405.

The product of its digits is 360, while the sum is 21.

The square root of 135831 is about 368.5525742686. The cubic root of 135831 is about 51.4043216804.

The spelling of 135831 in words is "one hundred thirty-five thousand, eight hundred thirty-one".