111840231 has 4 divisors (see below), whose sum is σ = 149120312. Its totient is φ = 74560152.

The previous prime is 111840217. The next prime is 111840271. The reversal of 111840231 is 132048111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 111840231 - 2²² = 107645927 is a prime.

It is a super-2 number, since 2×111840231² = 25016474540266722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111840198 and 111840207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111840271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18640036 + ... + 18640041.

It is an arithmetic number, because the mean of its divisors is an integer number (37280078).

Almost surely, 2^111840231 is an apocalyptic number.

111840231 is a deficient number, since it is larger than the sum of its proper divisors (37280081).

111840231 is an equidigital number, since it uses as much as digits as its factorization.

111840231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37280080.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 111840231 is about 10575.4541746442. The cubic root of 111840231 is about 481.7991377965.

Adding to 111840231 its reverse (132048111), we get a palindrome (243888342).

The spelling of 111840231 in words is "one hundred eleven million, eight hundred forty thousand, two hundred thirty-one".