231313111111 has 16 divisors (see below), whose sum is σ = 249344409600. Its totient is φ = 213875460288.

The previous prime is 231313111103. The next prime is 231313111121. The reversal of 231313111111 is 111111313132.

It is a cyclic number.

It is not a de Polignac number, because 231313111111 - 2³ = 231313111103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231313111121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 943290 + ... + 1162936.

It is an arithmetic number, because the mean of its divisors is an integer number (15584025600).

Almost surely, 2^231313111111 is an apocalyptic number.

231313111111 is a deficient number, since it is larger than the sum of its proper divisors (18031298489).

231313111111 is a wasteful number, since it uses less digits than its factorization.

231313111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220998.

The product of its digits is 54, while the sum is 19.

Adding to 231313111111 its reverse (111111313132), we get a palindrome (342424424243).

The spelling of 231313111111 in words is "two hundred thirty-one billion, three hundred thirteen million, one hundred eleven thousand, one hundred eleven".