111121231 has 24 divisors (see below), whose sum is σ = 129865680. Its totient is φ = 94189056.

The previous prime is 111121229. The next prime is 111121237. The reversal of 111121231 is 132121111.

It is a happy number.

It is not a de Polignac number, because 111121231 - 2¹ = 111121229 is a prime.

It is a super-2 number, since 2×111121231² = 24695855957910722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121237) 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 23 ways as a sum of consecutive naturals, for example, 620700 + ... + 620878.

It is an arithmetic number, because the mean of its divisors is an integer number (5411070).

Almost surely, 2^111121231 is an apocalyptic number.

111121231 is a deficient number, since it is larger than the sum of its proper divisors (18744449).

111121231 is a wasteful number, since it uses less digits than its factorization.

111121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 262 counting only the distinct ones).

The product of its digits is 12, while the sum is 13.

The square root of 111121231 is about 10541.4055514433. The cubic root of 111121231 is about 480.7644517314.

Adding to 111121231 its reverse (132121111), we get a palindrome (243242342).

The spelling of 111121231 in words is "one hundred eleven million, one hundred twenty-one thousand, two hundred thirty-one".