136231 has 4 divisors (see below), whose sum is σ = 138600. Its totient is φ = 133864.

The previous prime is 136223. The next prime is 136237. The reversal of 136231 is 132631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136231 - 2³ = 136223 is a prime.

It is a super-2 number, since 2×136231² = 37117770722, which contains 22 as substring.

It is a Duffinian number.

136231 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1096 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (34650).

2¹³⁶²³¹ is an apocalyptic number.

136231 is a deficient number, since it is larger than the sum of its proper divisors (2369).

136231 is an equidigital number, since it uses as much as digits as its factorization.

136231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368.

The product of its digits is 108, while the sum is 16.

The square root of 136231 is about 369.0948387610. The cubic root of 136231 is about 51.4547313266.

Adding to 136231 its reverse (132631), we get a palindrome (268862).

Subtracting from 136231 its reverse (132631), we obtain a square (3600 = 60²).

It can be divided in two parts, 13 and 6231, that multiplied together give a triangular number (81003 = T₄₀₂).

The spelling of 136231 in words is "one hundred thirty-six thousand, two hundred thirty-one".