111111120231 has 16 divisors (see below), whose sum is σ = 153484520160. Its totient is φ = 71413493760.

The previous prime is 111111120229. The next prime is 111111120251. The reversal of 111111120231 is 132021111111.

It is not a de Polignac number, because 111111120231 - 2¹ = 111111120229 is a prime.

It is a super-2 number, since 2×111111120231² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111111120231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111120221) 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, 890290 + ... + 1007391.

It is an arithmetic number, because the mean of its divisors is an integer number (9592782510).

Almost surely, 2^111111120231 is an apocalyptic number.

111111120231 is a deficient number, since it is larger than the sum of its proper divisors (42373399929).

111111120231 is a wasteful number, since it uses less digits than its factorization.

111111120231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1898386.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 111111120231 its reverse (132021111111), we get a palindrome (243132231342).

The spelling of 111111120231 in words is "one hundred eleven billion, one hundred eleven million, one hundred twenty thousand, two hundred thirty-one".