135231 has 4 divisors (see below), whose sum is σ = 180312. Its totient is φ = 90152.

The previous prime is 135221. The next prime is 135241. The reversal of 135231 is 132531.

Adding to 135231 its reverse (132531), we get a palindrome (267762).

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (135221) and next prime (135241).

It is a cyclic number.

It is not a de Polignac number, because 135231 - 2^{10} = 134207 is a prime.

It is a super-2 number, since 2×135231^{2} = 36574846722, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number *n* which added to its sum of digits gives 135231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22536 + ... + 22541.

It is an arithmetic number, because the mean of its divisors is an integer number (45078).

2^{135231} is an apocalyptic number.

135231 is a deficient number, since it is larger than the sum of its proper divisors (45081).

135231 is an equidigital number, since it uses as much as digits as its factorization.

135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45080.

The product of its digits is 90, while the sum is 15.

The square root of 135231 is about 367.7376782436. The cubic root of 135231 is about 51.3285213158.

The spelling of 135231 in words is "one hundred thirty-five thousand, two hundred thirty-one".

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