231135111 has 12 divisors (see below), whose sum is σ = 353500992. Its totient is φ = 145025856.

The previous prime is 231135103. The next prime is 231135131. The reversal of 231135111 is 111531132.

231135111 is a `hidden beast` number, since 2 + 311 + 351 + 1 + 1 = 666.

It is not a de Polignac number, because 231135111 - 2³ = 231135103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231135131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 755191 + ... + 755496.

It is an arithmetic number, because the mean of its divisors is an integer number (29458416).

Almost surely, 2^231135111 is an apocalyptic number.

231135111 is a deficient number, since it is larger than the sum of its proper divisors (122365881).

231135111 is a wasteful number, since it uses less digits than its factorization.

231135111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510710 (or 1510707 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 231135111 is about 15203.1283293933. The cubic root of 231135111 is about 613.6988473538.

Adding to 231135111 its reverse (111531132), we get a palindrome (342666243).

It can be divided in two parts, 23113 and 5111, that added together give a square (28224 = 168²).

The spelling of 231135111 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred eleven".