231111310111 has 16 divisors (see below), whose sum is σ = 252815574528. Its totient is φ = 209523283200.

The previous prime is 231111310103. The next prime is 231111310151. The reversal of 231111310111 is 111013111132.

It is not a de Polignac number, because 231111310111 - 2³ = 231111310103 is a prime.

It is a super-2 number, since 2×231111310111² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231111310151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9210895 + ... + 9235951.

It is an arithmetic number, because the mean of its divisors is an integer number (15800973408).

Almost surely, 2^231111310111 is an apocalyptic number.

231111310111 is a deficient number, since it is larger than the sum of its proper divisors (21704264417).

231111310111 is a wasteful number, since it uses less digits than its factorization.

231111310111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27342.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 231111310111 its reverse (111013111132), we get a palindrome (342124421243).

The spelling of 231111310111 in words is "two hundred thirty-one billion, one hundred eleven million, three hundred ten thousand, one hundred eleven".