135216231 has 8 divisors (see below), whose sum is σ = 181285104. Its totient is φ = 89645760.

The previous prime is 135216223. The next prime is 135216247. The reversal of 135216231 is 132612531.

135216231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135216231 - 2³ = 135216223 is a prime.

It is a super-2 number, since 2×135216231² = 36566858251690722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135215231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123966 + ... + 125051.

It is an arithmetic number, because the mean of its divisors is an integer number (22660638).

Almost surely, 2^135216231 is an apocalyptic number.

135216231 is a deficient number, since it is larger than the sum of its proper divisors (46068873).

135216231 is a wasteful number, since it uses less digits than its factorization.

135216231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249201.

The product of its digits is 1080, while the sum is 24.

The square root of 135216231 is about 11628.2514162706. The cubic root of 135216231 is about 513.2665266501.

Adding to 135216231 its reverse (132612531), we get a palindrome (267828762).

The spelling of 135216231 in words is "one hundred thirty-five million, two hundred sixteen thousand, two hundred thirty-one".