231312111 has 8 divisors (see below), whose sum is σ = 318365184. Its totient is φ = 149233560.

The previous prime is 231312083. The next prime is 231312113. The reversal of 231312111 is 111213132.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-231312111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312113) 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 7 ways as a sum of consecutive naturals, for example, 1243521 + ... + 1243706.

It is an arithmetic number, because the mean of its divisors is an integer number (39795648).

Almost surely, 2^231312111 is an apocalyptic number.

231312111 is a deficient number, since it is larger than the sum of its proper divisors (87053073).

231312111 is a wasteful number, since it uses less digits than its factorization.

231312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487261.

The product of its digits is 36, while the sum is 15.

The square root of 231312111 is about 15208.9483857366. The cubic root of 231312111 is about 613.8554613497.

Adding to 231312111 its reverse (111213132), we get a palindrome (342525243).

It can be divided in two parts, 2313121 and 11, that added together give a palindrome (2313132).

The spelling of 231312111 in words is "two hundred thirty-one million, three hundred twelve thousand, one hundred eleven".