136831 has 4 divisors (see below), whose sum is σ = 137592. Its totient is φ = 136072.

The previous prime is 136813. The next prime is 136841. The reversal of 136831 is 138631.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 138631 = 157 ⋅883.

It is a cyclic number.

It is not a de Polignac number, because 136831 - 2⁹ = 136319 is a prime.

It is a super-2 number, since 2×136831² = 37445445122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60 + ... + 526.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2¹³⁶⁸³¹ is an apocalyptic number.

136831 is a deficient number, since it is larger than the sum of its proper divisors (761).

136831 is an equidigital number, since it uses as much as digits as its factorization.

136831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its digits is 432, while the sum is 22.

The square root of 136831 is about 369.9067450047. The cubic root of 136831 is about 51.5301611116.

The spelling of 136831 in words is "one hundred thirty-six thousand, eight hundred thirty-one".