135524231 has 4 divisors (see below), whose sum is σ = 136355832. Its totient is φ = 134692632.

The previous prime is 135524209. The next prime is 135524251. The reversal of 135524231 is 132425531.

It is a happy number.

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 135524231 - 2¹⁸ = 135262087 is a prime.

It is a super-2 number, since 2×135524231² = 36733634376282722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135524231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135524201) 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, 415556 + ... + 415881.

It is an arithmetic number, because the mean of its divisors is an integer number (34088958).

Almost surely, 2^135524231 is an apocalyptic number.

135524231 is a deficient number, since it is larger than the sum of its proper divisors (831601).

135524231 is an equidigital number, since it uses as much as digits as its factorization.

135524231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831600.

The product of its digits is 3600, while the sum is 26.

The square root of 135524231 is about 11641.4874908664. The cubic root of 135524231 is about 513.6559429440.

Adding to 135524231 its reverse (132425531), we get a palindrome (267949762).

The spelling of 135524231 in words is "one hundred thirty-five million, five hundred twenty-four thousand, two hundred thirty-one".