231211135 has 16 divisors (see below), whose sum is σ = 295272000. Its totient is φ = 173200896.

The previous prime is 231211109. The next prime is 231211153. The reversal of 231211135 is 531112132.

It is not a de Polignac number, because 231211135 - 2⁵ = 231211103 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10081 + ... + 23749.

It is an arithmetic number, because the mean of its divisors is an integer number (18454500).

Almost surely, 2^231211135 is an apocalyptic number.

231211135 is a deficient number, since it is larger than the sum of its proper divisors (64060865).

231211135 is a wasteful number, since it uses less digits than its factorization.

231211135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13890.

The product of its digits is 180, while the sum is 19.

The square root of 231211135 is about 15205.6283987213. The cubic root of 231211135 is about 613.7661250694.

Adding to 231211135 its reverse (531112132), we get a palindrome (762323267).

The spelling of 231211135 in words is "two hundred thirty-one million, two hundred eleven thousand, one hundred thirty-five".