135231043 has 4 divisors (see below), whose sum is σ = 135639928. Its totient is φ = 134822160.

The previous prime is 135231013. The next prime is 135231049. The reversal of 135231043 is 340132531.

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 135231043 - 2⁵ = 135231011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135231049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203946 + ... + 204607.

It is an arithmetic number, because the mean of its divisors is an integer number (33909982).

Almost surely, 2^135231043 is an apocalyptic number.

135231043 is a deficient number, since it is larger than the sum of its proper divisors (408885).

135231043 is an equidigital number, since it uses as much as digits as its factorization.

135231043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408884.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 135231043 is about 11628.8882959636. Note that the first 3 decimals coincide. The cubic root of 135231043 is about 513.2852675615.

Adding to 135231043 its reverse (340132531), we get a palindrome (475363574).

The spelling of 135231043 in words is "one hundred thirty-five million, two hundred thirty-one thousand, forty-three".